Add custom timeout to detect stuck CI runs early (#4671)

### Change Summary
Added custom timeout for `Tests` job of the `Test SPIRVRunner` workflow
based on historical data that could lead to resource savings and faster
CI for the project.

Author: kitsiosk

.github/workflows/spirvrunner-test.yml

@@ -21,6 +21,7 @@ jobs:
     runs-on:
       - rolling
       - runner-0.0.22
+    timeout-minutes: 75 # equal to max + 3*std over the last 600 successful runs
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4