builtin/gc: move geometric repacking into `odb_optimize()`

We have two major object database optimization strategies:

  - The legacy strategy used by git-gc(1), which absorbs loose objects
    into packfiles, and eventually merges all packfiles once we have too
    many of them.

  - The more recent "geometric" strategy used by git-maintenance(1),
    which merges packfiles using a geometric sequence.

These two strategies are still using completely separate code paths. In
a subsequent commit we'll want to make both strategies pluggable though.

Prepare for this change by merging the "geometric" strategy into
`odb_optimize()`. This also allows us to reuse some of the logic we have
in that function.

Note that this change requires us to adapt tests because we're now using
"-q" instead of "--quiet". Naturally though, these invocations are of
course equivalent to one another.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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