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

[kamoltat]

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.

backporting the relevant commits from master PR:

#43999

Fixes: https://tracker.ceph.com/issues/53348

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