Fixes #36857 - Run content count update on smart proxy after orphan cleanup

[sjha4]

What are the changes introduced in this pull request?

Trigger a content count update task after running orphan cleanup

Considerations taken when implementing this change?

What are the testing steps for this pull request?

1. Have a proxy and some content views/envs tied to it and sync the capsule.
2. Check the result from endpoint /katello/api/capsules/:id/content/counts
3. Remove an env from capsule and don't sync.
4. Run bundle exec rails katello:delete_orphaned_content
5. Check the result from endpoint /katello/api/capsules/:id/content/counts
6. The content_counts will remain the same.
7. Checkout this PR.
8. Run bundle exec rails katello:delete_orphaned_content
9. The content_counts should get updated to reflect only envs still tied to smart_proxy.

[sjha4]

Need to update the update_content_count method to update content_count instead of returning when repos is empty on capsule. Will do after either merging the other PR or will need to rebase.

[ianballou]

Works great for me!