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

[Davide Grohmann via llvm-commits]

================
@@ -9,6 +9,7 @@ on:
     paths:
       - 'llvm/lib/Target/SPIRV/**'
       - 'llvm/test/CodeGen/SPIRV/**'
+      - 'mlir/test/Target/SPIRV/**'
----------------
davidegrohmann wrote:

Updated

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