Update conventional-commits-PR-title.yml file to restrict PR workflow to internal branches only

Author: atifather

.github/workflows/conventional-commits-PR-title.yml

@@ -9,6 +9,7 @@ on:
 jobs:
   lint-pr:
     name: Lint pull request title
+    if: github.event.pull_request.head.repo.full_name == github.repository
     runs-on: ubuntu-latest
     steps:
       - name: Lint pull request title