ci: Do not run conflict checker when label is applied (#7774)

Co-authored-by: Bart <11445373+bthomee@users.noreply.github.com>

.github/workflows/conflicting-pr.yml

@@ -14,6 +14,7 @@ permissions:
 
 jobs:
   main:
+    if: ${{ !contains(github.event.pull_request.labels.*.name, 'IgnoreConflicts') }}
     runs-on: ubuntu-latest
     steps:
       - name: Check if PRs are dirty