Handle SHA-256 zero OIDs in pre-push - #3738
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Fixes #3664.
Git emits 64-character zero OIDs in SHA-256 repositories. The pre-push hook only recognised the SHA-1 zero OID, so deletion pushes could fall through into revision range handling instead of being skipped.
This recognises all-zero OIDs for both SHA-1 and SHA-256, and adds a regression test for deleting a branch from a SHA-256 repository.
Tested with: