[llvm] [mlir][spirv] Add mlir-spirv-tests CI to run for mlir-spv target tests (PR #152124)

[Igor Wodiany via llvm-commits]

================
@@ -0,0 +1,31 @@
+name: MLIR SPIR-V Tests
+
+permissions:
+  contents: read
+
+on:
+  workflow_dispatch:
+  pull_request:
+    paths:
+      - 'mlir/include/mlir/Dialect/SPIRV/**'
+      - 'mlir/lib/Dialect/SPIRV/**'
+      - 'mlir/lib/Target/SPIRV/**'
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IgWod-IMG wrote:

`mlir/include/mlir/Target/SPIRV/SPIRVBinaryUtils.h` has few small things that can break the binary format, so I'd be inclined to add it. Even if we add it'll run very rarely but can potentially catch some bugs, so I don’t see the harm.

https://github.com/llvm/llvm-project/pull/152124