run-command: offer to close the object store before running

Especially on Windows, where files cannot be deleted if _any_ process
holds an open file handle to them, it is important to close the object
store (releasing all handles to all `.pack` files) before running a
command that might spawn a garbage collection.

This scenario is so common that we frequently see the pattern of closing
the object store before running auto maintenance or another Git command.

Let's make this much more convenient by teaching the `run_command()`
machinery a new flag to release the object store before spawning the
process.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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