Add the ability to opt-in to testing all hardware configs

This will allow us to opt in to the new nvidia and amd testing
configurations as we work through the test failures.

Author: llvm-beanz

.github/workflows/pr-matrix.yaml

@@ -42,7 +42,25 @@ jobs:
       SKU: ${{ matrix.SKU }}
       TestTarget: ${{ matrix.TestTarget }}
       OffloadTest-branch: ${{ github.event.pull_request.head.sha }}
-      LLVM-ExtraCMakeArgs: -DCMAKE_C_COMPILER=clang-cl -DCMAKE_CXX_COMPILER=clang-cl -DOFFLOADTEST_USE_CLANG_TIDY=On
+      LLVM-ExtraCMakeArgs: -DCMAKE_C_COMPILER=clang-cl
+      -DCMAKE_CXX_COMPILER=clang-cl -DOFFLOADTEST_USE_CLANG_TIDY=On
+
+  Exec-Tests-Extra:
+    if: ${{ github.event.label.name == 'test-all' }}
+    strategy:
+      fail-fast: false
+      matrix:
+        SKU: [windows-nvidia, windows-amd]
+        TestTarget: [check-hlsl-d3d12, check-hlsl-vk, check-hlsl-clang-d3d12, check-hlsl-clang-vk]
+
+    uses: ./.github/workflows/build-and-test-callable.yaml
+    with:
+      OS: windows
+      SKU: ${{ matrix.SKU }}
+      TestTarget: ${{ matrix.TestTarget }}
+      OffloadTest-branch: ${{ github.event.pull_request.head.sha }}
+      LLVM-ExtraCMakeArgs: -DCMAKE_C_COMPILER=clang-cl
+      -DCMAKE_CXX_COMPILER=clang-cl -DOFFLOADTEST_USE_CLANG_TIDY=On
 
   Exec-Tests-MacOS:
     strategy: