chore: update gapic-generator-java to 0.0.18 (#169)

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Synth log will be available here:
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PiperOrigin-RevId: 350949863
Source-Link: googleapis/googleapis@91e206b

java-workflows/google-cloud-workflows/src/main/java/com/google/cloud/workflows/v1beta/WorkflowsClient.java

@@ -95,7 +95,7 @@
  * <p>Please refer to the GitHub repository's samples for more quickstart code snippets.
  */
 @BetaApi
-@Generated("by gapic-generator")
+@Generated("by gapic-generator-java")
 public class WorkflowsClient implements BackgroundResource {
   private final WorkflowsSettings settings;
   private final WorkflowsStub stub;

java-workflows/google-cloud-workflows/src/main/java/com/google/cloud/workflows/v1beta/WorkflowsSettings.java

@@ -68,6 +68,7 @@
  * WorkflowsSettings workflowsSettings = workflowsSettingsBuilder.build();
  * }</pre>
  */
+@BetaApi
 @Generated("by gapic-generator-java")
 public class WorkflowsSettings extends ClientSettings<WorkflowsSettings> {
 

java-workflows/google-cloud-workflows/src/main/java/com/google/cloud/workflows/v1beta/stub/GrpcWorkflowsCallableFactory.java

@@ -16,6 +16,7 @@
 
 package com.google.cloud.workflows.v1beta.stub;
 
+import com.google.api.core.BetaApi;
 import com.google.api.gax.grpc.GrpcCallSettings;
 import com.google.api.gax.grpc.GrpcCallableFactory;
 import com.google.api.gax.grpc.GrpcStubCallableFactory;
@@ -41,7 +42,8 @@
  *
  * <p>This class is for advanced usage.
  */
-@Generated("by gapic-generator")
+@BetaApi
+@Generated("by gapic-generator-java")
 public class GrpcWorkflowsCallableFactory implements GrpcStubCallableFactory {
 
   @Override

java-workflows/google-cloud-workflows/src/main/java/com/google/cloud/workflows/v1beta/stub/GrpcWorkflowsStub.java

@@ -18,6 +18,7 @@
 
 import static com.google.cloud.workflows.v1beta.WorkflowsClient.ListWorkflowsPagedResponse;
 
+import com.google.api.core.BetaApi;
 import com.google.api.gax.core.BackgroundResource;
 import com.google.api.gax.core.BackgroundResourceAggregation;
 import com.google.api.gax.grpc.GrpcCallSettings;
@@ -51,6 +52,7 @@
  *
  * <p>This class is for advanced usage and reflects the underlying API directly.
  */
+@BetaApi
 @Generated("by gapic-generator-java")
 public class GrpcWorkflowsStub extends WorkflowsStub {
   private static final MethodDescriptor<ListWorkflowsRequest, ListWorkflowsResponse>

java-workflows/google-cloud-workflows/src/main/java/com/google/cloud/workflows/v1beta/stub/WorkflowsStub.java

@@ -18,6 +18,7 @@
 
 import static com.google.cloud.workflows.v1beta.WorkflowsClient.ListWorkflowsPagedResponse;
 
+import com.google.api.core.BetaApi;
 import com.google.api.gax.core.BackgroundResource;
 import com.google.api.gax.rpc.OperationCallable;
 import com.google.api.gax.rpc.UnaryCallable;
@@ -40,7 +41,8 @@
  *
  * <p>This class is for advanced usage and reflects the underlying API directly.
  */
-@Generated("by gapic-generator")
+@BetaApi
+@Generated("by gapic-generator-java")
 public abstract class WorkflowsStub implements BackgroundResource {
 
   public OperationsStub getOperationsStub() {

java-workflows/synth.metadata

@@ -4,15 +4,15 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-workflows.git",
-        "sha": "49a4ca66f8cf9c77b3a4b66d699549aa3292dc51"
+        "sha": "d67f595f3700ca0562a3086f9f64dc14f8c1014d"
       }
     },
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "857f70daef9f4c38f042fb3dfb7b8423ae18fd19",
-        "internalRef": "346372957"
+        "sha": "91e206bcfeaf8948ea03fe3cb1b7616108496cd3",
+        "internalRef": "350949863"
       }
     },
     {