Merge branch 'ps/avoid-unnecessary-hook-invocation-with-packed-refs'

Because a deletion of ref would need to remove it from both the loose ref store and the packed ref store, a delete-ref operation that logically removes one ref may end up invoking ref-transaction hook twice, which has been corrected. * ps/avoid-unnecessary-hook-invocation-with-packed-refs: refs: skip hooks when deleting uncovered packed refs refs: do not execute reference-transaction hook on packing refs refs: demonstrate excessive execution of the reference-transaction hook refs: allow skipping the reference-transaction hook refs: allow passing flags when beginning transactions refs: extract packed_refs_delete_refs() to allow control of transaction