commit-graph: use parse_options_concat()

commit-graph: use parse_options_concat()

Make use of the parse_options_concat() so we don't need to copy/paste
common options like --object-dir.

This is inspired by a similar change to "checkout" in 2087182272
(checkout: split options[] array in three pieces, 2019-03-29), and the
same pattern in the multi-pack-index command, see
60ca94769ce (builtin/multi-pack-index.c: split sub-commands,
2021-03-30).

A minor behavior change here is that now we're going to list both
--object-dir and --progress first, before we'd list --progress along
with other options.

Co-authored-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Reviewed-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>