ab/config-based-hooks-2

On Mon, Oct 18 2021, Junio C Hamano wrote:

* ab/config-based-hooks-2 (2021-10-15) 14 commits
 - run-command: remove old run_hook_{le,ve}() hook API
 - receive-pack: convert push-to-checkout hook to hook.h
 - read-cache: convert post-index-change to use hook.h
 - commit: convert {pre-commit,prepare-commit-msg} hook to hook.h
 - git-p4: use 'git hook' to run hooks
 - send-email: use 'git hook run' for 'sendemail-validate'
 - git hook run: add an --ignore-missing flag
 - merge: convert post-merge to use hook.h
 - hooks: convert 'post-checkout' hook to hook library
 - am: convert applypatch to use hook.h
 - rebase: convert pre-rebase to use hook.h
 - gc: use hook library for pre-auto-gc hook
 - hook: add 'run' subcommand
 - Merge branch 'ab/config-based-hooks-1' into ab/config-based-hooks-2

 More "config-based hooks".

 Breaks t2400.

Re-rolled with a fix for that per
https://lore.kernel.org/git/cover-v3-00.13-00000000000-20211019T231647Z-avarab@gmail.com/ (local);
sorry about the breakage.