🔧 Fix PR release validation workflow permissions and timeout

- Add proper permissions (contents: read, pull-requests: read)
- Add timeout-minutes: 5 for reliability
- Ensure consistent workflow structure across all PR workflows

Author: Stijnus

.github/workflows/pr-release-validation.yaml

@@ -6,9 +6,14 @@ on:
     branches:
       - feature/project-workflows
 
+permissions:
+  contents: read
+  pull-requests: read
+
 jobs:
   validate:
     runs-on: ubuntu-latest
+    timeout-minutes: 5
 
     steps:
       - uses: actions/checkout@v4