Revert "Add target check for PR"

This reverts commit 31e93d5774.

.github/workflows/check-target.yml

@@ -1,16 +0,0 @@
-# .github/workflows/check-branches.yml
-name: Check PR Source
-on:
-  pull_request_target:
-    branches: [ "main", "dev" ]
-
-jobs:
-  validate-branches:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Check source branch
-        run: |
-          if [ "${{ github.event.pull_request.head.ref }}" != "dev" ]; then
-            echo "PRs to main must come from dev branch"
-            exit 1
-          fi