Fail slang-test when VVL printed errors (#8280)

fixes https://github.com/shader-slang/slang/issues/8271

This PR does the following,
- Fail slang-test when there are VVL error messages.
- VVL error for `gfx-unit-test-tool/` were not captured properly by the
debug callback.
- Set an environment variable,
`VK_INSTANCE_LAYERS=VK_LAYER_KHRONOS_validation`, for CI and
VisualStudio project setup.
- Ignores VVL error about NullHandle is used for the acceleration
structure; a fix is at ToT of VVL and not available from release build
yet.
- Fix VVL error complaining about the varying inputs are not provided
for the tests, `gfx-unit-test-tool/linkTimeTypeLayout.internal` and
`gfx-unit-test-tool/linkTimeTypeLayoutNested.internal`.

---------

Co-authored-by: slangbot <ellieh+slangbot@nvidia.com>
Co-authored-by: slangbot <186143334+slangbot@users.noreply.github.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/tools/gfx-unit-test/gfx-test-util.cpp b/tools/gfx-unit-test/gfx-test-util.cpp
index 2e3efe09f..b407f19cc 100644
--- a/tools/gfx-unit-test/gfx-test-util.cpp
+++ b/tools/gfx-unit-test/gfx-test-util.cpp
@@ -252,6 +252,7 @@ Slang::ComPtr<IDevice> createTestingDevice(
     {
         deviceDesc.enableValidation = context->enableDebugLayers;
         deviceDesc.debugCallback = context->debugCallback;
+        getRHI()->enableDebugLayers();
     }
 
     D3D12DeviceExtendedDesc extDesc = {};