Fix Android workload detection issue on Linux builds (#10216)

Fixes: #10215
Context: 20de949

This PR fixes an issue where Android workload detection was failing on
Linux during local builds, causing the error:

    error NETSDK1147: To build this project, the following workloads must be installed: android
    To install these workloads, run the following command: dotnet workload restore

## Root Cause

The issue was in
`build-tools/create-packs/ConfigureLocalWorkload.targets` where the
Linux-specific workload configuration was using only
`"microsoft-net-runtime-android"` as the extends element, while
non-Linux platforms were dynamically extracting the full extends array
from the WorkloadManifest.json file.

The full extends array includes additional required dependencies:
- `"microsoft-net-runtime-android-net9"`
- `"microsoft-net-runtime-android"`
- AOT dependencies (which are excluded on Linux due to compatibility
  issues)

To fix this, we can check `$(GITHUB_ACTIONS)` env var to decide if
we should run the workaround or not.

Author: Copilot

build-tools/create-packs/ConfigureLocalWorkload.targets

@@ -90,13 +90,13 @@
         Targets="_GenerateXAWorkloadContent"
     />
 
-    <GetAndroidWorkloadExtends Condition="!$([MSBuild]::IsOSPlatform('linux'))" JsonFilePath="$(_LocalAndroidManifestFolder)WorkloadManifest.json">
+    <GetAndroidWorkloadExtends Condition="!$([MSBuild]::IsOSPlatform('linux')) or '$(GITHUB_ACTIONS)' != 'true'" JsonFilePath="$(_LocalAndroidManifestFolder)WorkloadManifest.json">
       <Output TaskParameter="ExtendsElement" PropertyName="AndroidWorkloadExtendsElement" />
     </GetAndroidWorkloadExtends>
 
     <PropertyGroup>
-      <!-- Linux can fail to install "microsoft-net-runtime-android-aot" and Microsoft.NETCore.App.Runtime.AOT.linux-x64.Cross.android-x86 -->
-      <AndroidWorkloadExtendsElement Condition="$([MSBuild]::IsOSPlatform('linux'))">&quot;microsoft-net-runtime-android&quot;</AndroidWorkloadExtendsElement>
+      <!-- Copilot on Linux can fail to install "microsoft-net-runtime-android-aot" and Microsoft.NETCore.App.Runtime.AOT.linux-x64.Cross.android-x86 -->
+      <AndroidWorkloadExtendsElement Condition="$([MSBuild]::IsOSPlatform('linux')) and '$(GITHUB_ACTIONS)' == 'true'">&quot;microsoft-net-runtime-android&quot;</AndroidWorkloadExtendsElement>
       <_EmptyWorkloadJsonContent>
 <![CDATA[
 {"version": "0.0.1", "workloads": { "android-deps": { "extends" : [ $(AndroidWorkloadExtendsElement) ] } } }