Remove disabled Performance/PushSplat cop
This cop was removed in RuboCop 0.43.0. See https://github.com/bbatsov/rubocop/issues/3292
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This cop was removed in RuboCop 0.43.0. See https://github.com/bbatsov/rubocop/issues/3292