Fixes #36500 - Optimize DockerMetaTag query and CV version deletion to run a single invocation of the method

[sjha4]

What are the changes introduced in this pull request?

1. Avoid using pluck in Metatag cleanup.
2. Adds RepoMetaTag deletion before cleanup of schema_id = nil records to prevent foreign key violation failures.
3. Don't call metatag cleanup on repo destroy of every docker repo during CV version deletion or remove from environment.
4. Add metatag cleanup to finalize of those 2 actions directly so it runs once on each invocation.
5. Deleting CV version in environments calls both and hence metatag cleanup runs twice for that.
   Once for removing CV from environment and once for deleting CV version itself

Considerations taken when implementing this change?

What are the testing steps for this pull request?

1. Add several docker repos to a CV and publish/promote few versions.
2. Delete a version, make sure docker_cleanup param is set to false in repo_destroy finalize action spawned by CV version delete.
3. Test other actions like CV remove from env, Cv version delete, CV delete, repo delete etc. to make sure metatag cleanup doesn't happen every repo, rather only in finalize of parent actions like CVE delete or CVV delete.

[theforeman-bot]

Issues: #36500

[sjha4]

[test katello]

[sjha4]

Test failure related. Will update.

[parthaa]

Other than cleanup the code looks ok. I am going to quickly test once the suggested changes have been addressed.

[parthaa]

Works as advertised :)