ci: cap unit test jobs at 30 minutes

Author: oetr

.github/workflows/run-all-tests-pr.yaml

@@ -44,6 +44,7 @@ jobs:
   tests:
     name: unit tests
     runs-on: ${{ matrix.os }}
+    timeout-minutes: 30
     strategy:
       matrix:
         os: [windows-latest, ubuntu-latest, ubuntu-24.04-arm, macos-latest]