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

builtin/am.c

@@ -1848,7 +1848,6 @@ next:
 	 */
 	if (!state->rebasing) {
 		am_destroy(state);
-		close_object_store(the_repository->objects);
 		run_auto_maintenance(state->quiet);
 	}
 }