Add Fusion composition tests for @deprecated merging

src/HotChocolate/Fusion/test/Composition.Tests/DeprecationMergeTests.cs

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+using Xunit.Abstractions;
+
+namespace HotChocolate.Fusion.Composition;
+
+public class DeprecationMergeTests(ITestOutputHelper output) : CompositionTestBase(output)
+{
+    [Fact]
+    public async Task Merge_Entity_Output_Field_Deprecation()
+        => await Succeed(
+            """
+            type Query {
+              brandById(id: ID!): Brand
+            }
+
+            type Brand implements Node {
+              id: ID!
+              name: String! @deprecated(reason: "Some reason")
+            }
+
+            interface Node {
+              id: ID!
+            }
+            """,
+            """
+            type Query {
+              brandById(id: ID!): Brand
+            }
+
+            type Brand implements Node {
+              id: ID!
+              newName: String!
+            }
+
+            interface Node {
+              id: ID!
+            }
+            """);
+
+    [Fact]
+    public async Task Merge_Entity_Output_Field_Argument_Deprecation()
+        => await Succeed(
+            """
+            type Query {
+              brandById(id: ID!): Brand
+            }
+
+            type Brand implements Node {
+              id: ID!
+              name(includeFirstName: Boolean @deprecated(reason: "Some reason")): String!
+            }
+
+            interface Node {
+              id: ID!
+            }
+            """,
+            """
+            type Query {
+              brandById(id: ID!): Brand
+            }
+
+            type Brand implements Node {
+              id: ID!
+              name(includeFirstName: Boolean): String!
+            }
+
+            interface Node {
+              id: ID!
+            }
+            """);
+
+    [Fact]
+    public async Task Merge_Output_Field_Deprecation()
+        => await Succeed(
+            """
+            type Query {
+              brand: Brand
+            }
+
+            type Brand {
+              name: String! @deprecated(reason: "Some reason")
+            }
+            """,
+            """
+            type Query {
+              brand: Brand
+            }
+
+            type Brand {
+              newName: String!
+            }
+            """);
+
+    [Fact]
+    public async Task Merge_Output_Field_Argument_Deprecation()
+        => await Succeed(
+            """
+            type Query {
+              brand: Brand
+            }
+
+            type Brand {
+              name(includeFirstName: Boolean @deprecated(reason: "Some reason")): String!
+            }
+            """,
+            """
+            type Query {
+              brand: Brand
+            }
+
+            type Brand {
+              name(includeFirstName: Boolean): String!
+            }
+            """);
+
+    [Fact]
+    public async Task Merge_Enum_Value_Deprecation()
+        => await Succeed(
+            """
+            type Query {
+              value: OrderStatus
+            }
+
+            enum OrderStatus {
+              SENT_OUT @deprecated(reason: "Some reason")
+            }
+            """,
+            """
+            type Query {
+              value: OrderStatus
+            }
+
+            enum OrderStatus {
+              SHIPPED
+            }
+            """);
+}

src/HotChocolate/Fusion/test/Composition.Tests/__snapshots__/DeprecationMergeTests.Merge_Entity_Output_Field_Argument_Deprecation.graphql

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+schema
+  @fusion(version: 1)
+  @transport(subgraph: "A", location: "https:\/\/localhost:5001\/graphql", kind: "HTTP")
+  @transport(subgraph: "B", location: "https:\/\/localhost:5002\/graphql", kind: "HTTP") {
+  query: Query
+}
+
+type Query {
+  brandById(id: ID!): Brand
+    @variable(subgraph: "A", name: "id", argument: "id")
+    @resolver(subgraph: "A", select: "{ brandById(id: $id) }", arguments: [ { name: "id", type: "ID!" } ])
+    @variable(subgraph: "B", name: "id", argument: "id")
+    @resolver(subgraph: "B", select: "{ brandById(id: $id) }", arguments: [ { name: "id", type: "ID!" } ])
+}
+
+type Brand implements Node
+  @variable(subgraph: "A", name: "Brand_id", select: "id")
+  @variable(subgraph: "B", name: "Brand_id", select: "id")
+  @resolver(subgraph: "A", select: "{ brandById(id: $Brand_id) }", arguments: [ { name: "Brand_id", type: "ID!" } ])
+  @resolver(subgraph: "B", select: "{ brandById(id: $Brand_id) }", arguments: [ { name: "Brand_id", type: "ID!" } ]) {
+  id: ID!
+    @source(subgraph: "A")
+    @source(subgraph: "B")
+  name(includeFirstName: Boolean
+    @deprecated(reason: "Some reason")): String!
+    @source(subgraph: "A")
+    @variable(subgraph: "A", name: "includeFirstName", argument: "includeFirstName")
+    @source(subgraph: "B")
+    @variable(subgraph: "B", name: "includeFirstName", argument: "includeFirstName")
+}
+
+interface Node {
+  id: ID!
+}

src/HotChocolate/Fusion/test/Composition.Tests/__snapshots__/DeprecationMergeTests.Merge_Entity_Output_Field_Deprecation.graphql

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+schema
+  @fusion(version: 1)
+  @transport(subgraph: "A", location: "https:\/\/localhost:5001\/graphql", kind: "HTTP")
+  @transport(subgraph: "B", location: "https:\/\/localhost:5002\/graphql", kind: "HTTP") {
+  query: Query
+}
+
+type Query {
+  brandById(id: ID!): Brand
+    @variable(subgraph: "A", name: "id", argument: "id")
+    @resolver(subgraph: "A", select: "{ brandById(id: $id) }", arguments: [ { name: "id", type: "ID!" } ])
+    @variable(subgraph: "B", name: "id", argument: "id")
+    @resolver(subgraph: "B", select: "{ brandById(id: $id) }", arguments: [ { name: "id", type: "ID!" } ])
+}
+
+type Brand implements Node
+  @variable(subgraph: "A", name: "Brand_id", select: "id")
+  @variable(subgraph: "B", name: "Brand_id", select: "id")
+  @resolver(subgraph: "A", select: "{ brandById(id: $Brand_id) }", arguments: [ { name: "Brand_id", type: "ID!" } ])
+  @resolver(subgraph: "B", select: "{ brandById(id: $Brand_id) }", arguments: [ { name: "Brand_id", type: "ID!" } ]) {
+  id: ID!
+    @source(subgraph: "A")
+    @source(subgraph: "B")
+  name: String!
+    @source(subgraph: "A")
+    @deprecated(reason: "Some reason")
+  newName: String!
+    @source(subgraph: "B")
+}
+
+interface Node {
+  id: ID!
+}

src/HotChocolate/Fusion/test/Composition.Tests/__snapshots__/DeprecationMergeTests.Merge_Enum_Value_Deprecation.graphql

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+schema
+  @fusion(version: 1)
+  @transport(subgraph: "A", location: "https:\/\/localhost:5001\/graphql", kind: "HTTP")
+  @transport(subgraph: "B", location: "https:\/\/localhost:5002\/graphql", kind: "HTTP") {
+  query: Query
+}
+
+type Query {
+  value: OrderStatus
+    @resolver(subgraph: "A", select: "{ value }")
+    @resolver(subgraph: "B", select: "{ value }")
+}
+
+enum OrderStatus {
+  SENT_OUT
+    @source(subgraph: "A")
+    @deprecated(reason: "Some reason")
+  SHIPPED
+    @source(subgraph: "B")
+}

src/HotChocolate/Fusion/test/Composition.Tests/__snapshots__/DeprecationMergeTests.Merge_Output_Field_Argument_Deprecation.graphql

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+schema
+  @fusion(version: 1)
+  @transport(subgraph: "A", location: "https:\/\/localhost:5001\/graphql", kind: "HTTP")
+  @transport(subgraph: "B", location: "https:\/\/localhost:5002\/graphql", kind: "HTTP") {
+  query: Query
+}
+
+type Query {
+  brand: Brand
+    @resolver(subgraph: "A", select: "{ brand }")
+    @resolver(subgraph: "B", select: "{ brand }")
+}
+
+type Brand {
+  name(includeFirstName: Boolean
+    @deprecated(reason: "Some reason")): String!
+    @source(subgraph: "A")
+    @variable(subgraph: "A", name: "includeFirstName", argument: "includeFirstName")
+    @source(subgraph: "B")
+    @variable(subgraph: "B", name: "includeFirstName", argument: "includeFirstName")
+}

src/HotChocolate/Fusion/test/Composition.Tests/__snapshots__/DeprecationMergeTests.Merge_Output_Field_Deprecation.graphql

@@ -0,0 +1,20 @@
+schema
+  @fusion(version: 1)
+  @transport(subgraph: "A", location: "https:\/\/localhost:5001\/graphql", kind: "HTTP")
+  @transport(subgraph: "B", location: "https:\/\/localhost:5002\/graphql", kind: "HTTP") {
+  query: Query
+}
+
+type Query {
+  brand: Brand
+    @resolver(subgraph: "A", select: "{ brand }")
+    @resolver(subgraph: "B", select: "{ brand }")
+}
+
+type Brand {
+  name: String!
+    @source(subgraph: "A")
+    @deprecated(reason: "Some reason")
+  newName: String!
+    @source(subgraph: "B")
+}