pybind/mgr/progress: disable pg recovery event by default

pybind/mgr/progress: disable pg recovery event by default

The progress module disabled the pg recovery event by default
since the event is expensive and has interrupted other serviceis
when there is OSDs being marked in/out from the the cluster.

To turn the event on manually:

ceph config set mgr mgr/progress/allow_pg_recovery_event true

Updated qa/tasks/mgr/test_progress.py to enable
the pg recovery event when testing the progress module.

Signed-off-by: Kamoltat <ksirivad@redhat.com>