Ensure repo deletion also removes associated content and artifacts

[ShaiahWren]

Issue: AAH-2024

Prior to this pr, the delete_container_distribution method deleted the repo from the system, yet the associated content and artifacts remained.

To ensure all content is deleted, the content_pks in orphan cleanup for the method is now set to the content pks for the given repository and the orphan protection time, set to 0.

Plan of action:

1. Grab the repo ids through list comprehension of the instance_ids passed into the deletion method
2. Query objects in the RepositoryContent model and filter out the content pks associated with those repo ids. ( RepositoryContent.objects.filter(repository__pk__in = repo ids).values_list("content_pks").
3. Assign that list of content pks to the content pks field for orphan cleanup and set orphan_protection_time to 0.

That should be it!

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[patchback]

Backport to stable-4.6: 💚 backport PR created

✅ Backport PR branch: patchback/backports/stable-4.6/d1dfb7bf7e6e3b899d4a36a2d2e70535e148b216/pr-1603

Backported as #1627

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