pybind/mgr/pg_autoscale: revert to default profile scale-up

pybind/mgr/pg_autoscale: revert to default profile scale-up

pg_autoscale module will now start out all the pools
with a scale-up profile by default.

Added tests in workunits/mon/pg_autoscaler.sh
to evaluate if the default pool creation is
a scale-up profile

Updated documentation and release notes to
reflect the change in the default behavior
of the pg_autoscale profile.

Fixes: https://tracker.ceph.com/issues/53309
Signed-off-by: Kamoltat <ksirivad@redhat.com>