Merge branch 'jc/revert-ref-transaction-hook-changes'

Revert the "deletion of a ref should not trigger transaction events for loose and packed ref backends separately" that regresses the behaviour when a ref is not modified since it was packed. * jc/revert-ref-transaction-hook-changes: RelNotes: revert the description on the reverted topics Revert "fetch: increase test coverage of fetches" Revert "Merge branch 'ps/avoid-unnecessary-hook-invocation-with-packed-refs'"