Merge branch 'ps/packed-git-in-object-store'

The list of packfiles used in a running Git process is moved from the packed_git structure into the packfile store. * ps/packed-git-in-object-store: packfile: track packs via the MRU list exclusively packfile: always add packfiles to MRU when adding a pack packfile: move list of packs into the packfile store builtin/pack-objects: simplify logic to find kept or nonlocal objects packfile: fix approximation of object counts http: refactor subsystem to use `packfile_list`s packfile: move the MRU list into the packfile store packfile: use a `strmap` to store packs by name