Merge pull request #62701 from rhcs-dashboard/notification-create-api

mgr/dashboard: Notification endpoints for create ,list and delete

Reviewed-by: Nizamudeen A <nia@redhat.com>
Reviewed-by: Pedro Gonzalez <pegonzal@redhat.com>

diff --cc src/pybind/mgr/dashboard/controllers/rgw.py
Simple merge

diff --cc src/pybind/mgr/dashboard/openapi.yaml
Simple merge

diff --cc src/pybind/mgr/dashboard/services/rgw_client.py
Simple merge