Resolve "Documentation of `.gitlab-ci.yml` states incorrect example for variables"
What does this MR do?
Fix the variables override example (variables config should be a hash of key value pairs).
Fix #30337 (closed)
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Fix the variables override example (variables config should be a hash of key value pairs).
Fix #30337 (closed)