Propagate repository removal to Praefect backends

Paul Okstad (ex-GitLab)requested to merge
po-praefect-remove-repo into master

Closes #1914 (closed)

Closes #2136 (closed)

This change allows a special replication type (destructive) to remove a repo from secondaries when the RemoveRepository RPC is invoked on Praefect.

Also, some test code refactoring was done to allow proper clean up of resources.

Edited by GitLab Release Tools Bot

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