build: fix commit linter on unrebased PRs
The commit linter was checking out the PR HEAD commit instead of
merge/rebase commit, causing it to fail for any PRs that were not
rebased on our default branch. Removing ref should fix the issue.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
The commit linter was checking out the PR HEAD commit instead of
merge/rebase commit, causing it to fail for any PRs that were not
rebased on our default branch. Removing ref should fix the issue.