Improve resolving runtime pack in WasmApp targets

Import targetingpacks.targets in WasmApp.InTree.targets and use similar logic in WasmApp.LocalBuild.targets.

eng/targetingpacks.targets

@@ -11,6 +11,7 @@
 <Project>
   <PropertyGroup>
     <LocalFrameworkOverrideName>$(MicrosoftNetCoreAppFrameworkName)</LocalFrameworkOverrideName>
+    <TargetingpacksTargetsImported>true</TargetingpacksTargetsImported>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(DisableImplicitFrameworkReferences)' != 'true' and
@@ -103,7 +104,7 @@
     </ItemGroup>
   </Target>
 
-  <!-- Use local targeting pack for NetCoreAppCurrent. -->
+  <!-- Use local targeting/runtime pack for NetCoreAppCurrent. -->
   <Target Name="UpdateTargetingAndRuntimePack"
           Condition="'$(UseLocalTargetingRuntimePack)' == 'true'"
           AfterTargets="ResolveFrameworkReferences">

src/mono/wasm/build/WasmApp.InTree.targets

@@ -2,16 +2,11 @@
   <!-- This depends on the root Directory.Build.targets imported this file -->
   <UsingTask TaskName="MonoAOTCompiler" AssemblyFile="$(MonoAOTCompilerTasksAssemblyPath)" />
 
+  <Import Project="$(RepositoryEngineeringDir)targetingpacks.targets" Condition="'$(TargetingpacksTargetsImported)' != 'true'"/>
   <Import Project="$(MSBuildThisFileDirectory)WasmApp.targets" />
 
-  <!-- Redirect 'dotnet publish' to in-tree runtime pack -->
-  <Target Name="TrickRuntimePackLocation" AfterTargets="ProcessFrameworkReferences" Condition="@(RuntimePack->Count()) != 0">
-    <ItemGroup>
-      <RuntimePack>
-        <PackageDirectory>$([MSBuild]::NormalizeDirectory($(ArtifactsBinDir), 'microsoft.netcore.app.runtime.browser-wasm', $(Configuration)))</PackageDirectory>
-      </RuntimePack>
-    </ItemGroup>
-    <Message Text="Using RuntimePack.PackageDirectory: %(RuntimePack.PackageDirectory)" Importance="Low" />
+  <Target Name="PrintRuntimePackLocation" AfterTargets="UpdateTargetingAndRuntimePack">
+    <Message Text="Used runtime pack: %(ResolvedRuntimePack.PackageDirectory)" Importance="high" />
   </Target>
 
   <Target Name="RebuildWasmAppBuilder">

src/mono/wasm/build/WasmApp.LocalBuild.targets

@@ -26,6 +26,7 @@
   <PropertyGroup>
     <PublishTrimmed>true</PublishTrimmed>
     <TrimMode>link</TrimMode>
+    <UseMonoRuntime>true</UseMonoRuntime>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)' != 'Debug'">
@@ -37,14 +38,15 @@
     <DebuggerSupport>false</DebuggerSupport>
   </PropertyGroup>
 
-  <Target Name="UpdateTargetingAndRuntimePack" AfterTargets="ResolveFrameworkReferences" DependsOnTargets="_PrepareAndValidateWasmInputs">
+  <!-- Use local runtime pack -->
+  <Target Name="UpdateRuntimePack" AfterTargets="ResolveFrameworkReferences" DependsOnTargets="_PrepareAndValidateWasmInputs">
+    <Error Condition="@(ResolvedRuntimePack->Count()) == 0" Text="No runtime pack was resolved!" />
     <ItemGroup>
-      <RuntimePack>
-        <PackageDirectory>$(MicrosoftNetCoreAppRuntimePackLocationToUse)</PackageDirectory>
-      </RuntimePack>
-      <ResolvedRuntimePack PackageDirectory="$(MicrosoftNetCoreAppRuntimePackLocationToUse)" />
+      <ResolvedRuntimePack PackageDirectory="$(MicrosoftNetCoreAppRuntimePackLocationToUse)"
+                           Condition="'$(MicrosoftNetCoreAppRuntimePackLocationToUse)' != '' and
+                                      '%(ResolvedRuntimePack.FrameworkName)' == 'Microsoft.NETCore.App'" />
     </ItemGroup>
-    <Message Text="Using Runtime pack from: %(ResolvedRuntimePack.PackageDirectory)" Importance="high" />
+    <Message Text="Used runtime pack: %(ResolvedRuntimePack.PackageDirectory)" Importance="high" />
   </Target>
 
   <!-- the actual properties need to get set in the props, so because UsingTasks depend on those. -->