Fixes #34432 - Remove drpm from ignorable_content for roots

[sjha4]

What are the changes introduced in this pull request?

Adds a migration to remove drpm from irgnorable_content list for root repositories.

Considerations taken when implementing this change?

What are the testing steps for this pull request?

How I tested this:

1. Change katello/app/models/katello/root_repository.rb L20 to allow drpm as ignorable_content type:
   IGNORABLE_CONTENT_UNIT_TYPES = %w(srpm drpm).freeze
2. Change katello/app/lib/actions/katello/repository/update.rb file L13 to add
   repo_params[:ignorable_content] = ['srpm', 'drpm']
3. The changes above mean that any yum repo you update will get srpm and drpm as ignorable content. So update a couple yum repos, ex: name in your setup.
4. Go to foreman console: bundle exec rails c
5. Run Katello::RootRepository.select {|r| r&.ignorable_content&.include? "drpm"}
6. You should see a few root repository with drpm in the ignorable content list
7. Checkout this PR and run bundle exec rails db:migrate
8. Check Katello::RootRepository.select {|r| r&.ignorable_content&.include? "drpm"}. You shouldn't have any records.

[theforeman-bot]

Issues: #34432

[rverdile]

The migration forward works! Did you want it to be able to rollback? Or should it be irreversible? Right now if you rollback it doesn't do anything.

[sjha4]

I don't think there's any way to make this reversible cause once the migration is run, we have no way of knowing which repos had drpm in ignorable content during rollback.

[rverdile]

Good point. Do you think it needs "IrreversibleMigration"?

[sjha4]

@rverdile : Updated.. 👍🏼

[rverdile]

lgtm!