OSD::session_notify_pg_create: requeue at the start of the queue

Introduced: 2120f4bb6c5ba0f066d4541a51ce1d43c8ab6881
Fixes: #9205
Signed-off-by: Samuel Just <sam.just@inktank.com>
Merge remote-tracking branches 'origin/wip-9054', 'origin/wip-9240' and 'origin/wip-9205' into wip-sam-testing