Merge branch 'ds/rebase-update-ref'

"git rebase -i" learns to update branches whose tip appear in the rebased range with "--update-refs" option. source: <pull.1247.v5.git.1658255624.gitgitgadget@gmail.com> * ds/rebase-update-ref: sequencer: notify user of --update-refs activity sequencer: ignore HEAD ref under --update-refs rebase: add rebase.updateRefs config option sequencer: rewrite update-refs as user edits todo list rebase: update refs from 'update-ref' commands rebase: add --update-refs option sequencer: add update-ref command sequencer: define array with enum values rebase-interactive: update 'merge' description branch: consider refs under 'update-refs' t2407: test branches currently using apply backend t2407: test bisect and rebase as black-boxes