ci: standardize release branch pattern to release-X.Y.x

Update all CI workflows and actions to use the standardized release branch
naming convention 'release-X.Y.x' (e.g., release-0.3.x) instead of matching
multiple numeric patterns.

Changes:
- Update workflow triggers to match 'release-[0-9]+.[0-9]+.x' pattern
- Update bash regex in setup-test-environment to match new format
- Simplifies branch pattern from multiple variants to single standard

.github/workflows/pre-commit.yml

@@ -7,9 +7,7 @@ on:
   push:
     branches:
       - main
-      - 'release-[0-9]+.[0-9]+.[0-9]+.[0-9]+'
-      - 'release-[0-9]+.[0-9]+.[0-9]+'
-      - 'release-[0-9]+.[0-9]+'
+      - 'release-[0-9]+.[0-9]+.x'
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref == 'refs/heads/main' && github.run_id || github.ref }}