crimson/osd/pg: Handle peer replies handling once received

crimson/osd/pg: Handle peer replies handling once received

Instead of updating last complete on disk and calling complete_write
in PG::submit_transacion (chained to all_completed).

Move the completion handling earlier as soon as all the peers acked.
This essentially means that we move the handling to
ReplicatedBackend::get_rep_op_reply, unless replication size is 1 -
then we would mark completion in ReplicatedBackend::submit_transaction.

Fixes: https://tracker.ceph.com/issues/69439
Signed-off-by: Matan Breizman <mbreizma@redhat.com>
Signed-off-by: Xuehan Xu <xuxuehan@qianxin.com>