Merge branch 'ps/remove-packfile-store-get-packs' into ps/packed-git-in-object-store

Merge branch 'ps/remove-packfile-store-get-packs' into ps/packed-git-in-object-store

* ps/remove-packfile-store-get-packs: (55 commits)
  packfile: rename `packfile_store_get_all_packs()`
  packfile: introduce macro to iterate through packs
  packfile: drop `packfile_store_get_packs()`
  builtin/grep: simplify how we preload packs
  builtin/gc: convert to use `packfile_store_get_all_packs()`
  object-name: convert to use `packfile_store_get_all_packs()`
  builtin/repack.c: clean up unused `#include`s
  repack: move `write_cruft_pack()` out of the builtin
  repack: move `write_filtered_pack()` out of the builtin
  repack: move `pack_kept_objects` to `struct pack_objects_args`
  repack: move `finish_pack_objects_cmd()` out of the builtin
  builtin/repack.c: pass `write_pack_opts` to `finish_pack_objects_cmd()`
  repack: extract `write_pack_opts_is_local()`
  repack: move `find_pack_prefix()` out of the builtin
  builtin/repack.c: use `write_pack_opts` within `write_cruft_pack()`
  builtin/repack.c: introduce `struct write_pack_opts`
  repack: 'write_midx_included_packs' API from the builtin
  builtin/repack.c: inline packs within `write_midx_included_packs()`
  builtin/repack.c: pass `repack_write_midx_opts` to `midx_included_packs`
  builtin/repack.c: inline `remove_redundant_bitmaps()`
  ...