Migration/UpdateColumnInBatches: Invalidate RuboCop's cache

What does this MR do and why?

If specs change in {,ee/}/spec/migrations/**/*_spec.rb change RuboCop's cache should be invalidated for this cop to avoid flaky results in CI.

See

• !121213 (merged)
• !122143 (merged)

This MR also refactor specs and resolves all pending RuboCop TODOs. See individual commits for more information.

How to set up and validate locally

bundle exec rubocop --only Migration/UpdateColumnInBatches db/migrate/20230322151605_rerun_remove_invalid_deploy_access_level.rb
.

1 file inspected, no offenses detected

rm spec/migrations/rerun_remove_invalid_deploy_access_level_spec.rb

bundle exec rubocop -C false --only Migration/UpdateColumnInBatches db/migrate/20230322151605_rerun_remove_invalid_deploy_a
ccess_level.rb
Inspecting 1 file
C

Offenses:

db/migrate/20230322151605_rerun_remove_invalid_deploy_access_level.rb:10:5: C: Migration/UpdateColumnInBatches: Migration running update_column_in_batches must have a spec file at spec/migrations/rerun_remove_invalid_deploy_access_level_spec.rb.
    update_column_in_batches(:protected_environment_deploy_access_levels, :access_level, nil) do |table, query|
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
db/migrate/20230322151605_rerun_remove_invalid_deploy_access_level.rb:16:5: C: Migration/UpdateColumnInBatches: Migration running update_column_in_batches must have a spec file at spec/migrations/rerun_remove_invalid_deploy_access_level_spec.rb.
    update_column_in_batches(:protected_environment_deploy_access_levels, :group_id, nil) do |table, query|
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

1 file inspected, 2 offenses detected

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.