Allow users to retry deletion for container image repository with deletion_failed_permanently status

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In #480652 (closed), we set a threshold on how many retries can happen to a container repository and if this is reached, we set the status of the container repository to deletion_failed_permanently.

To set the container repository for deletion again, manual intervention via the rails console is needed to set the status back to delete_scheduled.

This issue explores allowing users to retry container repository deletion via the UI.

We can also link to troubleshooting docs which would be added as part of #499013 (closed)