[browser] Add DiagnosticPorts to DOTNET_DiagnosticPorts environment variable (#122019)

Author: maraf

src/mono/nuget/Microsoft.NET.Sdk.WebAssembly.Pack/build/Microsoft.NET.Sdk.WebAssembly.Browser.targets

@@ -142,7 +142,12 @@ Copyright (c) .NET Foundation. All rights reserved.
       $(GenerateBuildWasmBootJsonDependsOn);
       GenerateBuildRuntimeConfigurationFiles;
       ResolveWasmOutputs;
+      _AddWasmDiagnosticPortsEnvironmentVariable;
     </GenerateBuildWasmBootJsonDependsOn>
+    <GeneratePublishWasmBootJsonDependsOn>
+      $(GeneratePublishWasmBootJsonDependsOn);
+      _AddWasmDiagnosticPortsEnvironmentVariable;
+    </GeneratePublishWasmBootJsonDependsOn>
   </PropertyGroup>
 
   <Target Name="_WasmNativeForBuild" DependsOnTargets="_GatherWasmFilesToBuild;WasmBuildApp" Condition="'$(UsingBrowserRuntimeWorkload)' == 'true'" />
@@ -386,6 +391,12 @@ Copyright (c) .NET Foundation. All rights reserved.
     </ItemGroup>
   </Target>
 
+  <Target Name="_AddWasmDiagnosticPortsEnvironmentVariable">
+    <ItemGroup>
+      <WasmEnvironmentVariable Include="DOTNET_DiagnosticPorts" Value="$(DiagnosticPorts)" Condition="'$(DiagnosticPorts)' != ''"/>
+    </ItemGroup>
+  </Target>
+
   <Target Name="_GenerateBuildWasmBootJson" DependsOnTargets="$(GenerateBuildWasmBootJsonDependsOn)">
     <PropertyGroup>
       <_WasmBuildBootJsonPath>$(IntermediateOutputPath)$(_WasmBootConfigFileName)</_WasmBuildBootJsonPath>

src/mono/sample/wasm/Directory.Build.targets

@@ -35,6 +35,7 @@
     <NestedBuildProperty Include="WasmEmitSymbolMap" />
     <NestedBuildProperty Include="WasmEnableThreads" />
     <NestedBuildProperty Include="EnableDiagnostics" />
+    <NestedBuildProperty Include="DiagnosticPorts" />
     <NestedBuildProperty Include="WasmPerformanceInstrumentation" />
   </ItemGroup>