Merge branch 'js/run-command-close-packs'

The run-command API has been updated so that the callers can easily
ask the file descriptors open for packfiles to be closed immediately
before spawning commands that may trigger auto-gc.

* js/run-command-close-packs:
  Close object store closer to spawning child processes
  run_auto_maintenance(): implicitly close the object store
  run-command: offer to close the object store before running
  run-command: prettify the `RUN_COMMAND_*` flags
  pull: release packs before fetching
  commit-graph: when closing the graph, also release the slab

diff --cc builtin/am.c
Simple merge

diff --cc builtin/fetch.c
Simple merge

diff --cc builtin/gc.c
Simple merge

diff --cc builtin/merge.c
Simple merge

diff --cc builtin/pull.c
Simple merge

diff --cc builtin/rebase.c
Simple merge

diff --cc builtin/receive-pack.c
Simple merge

diff --cc commit-graph.c
Simple merge

diff --cc run-command.c
Simple merge