mgr/dashboard: Disable multisite Action dropdown for read-only user

Fixes: https://tracker.ceph.com/issues/77570
Signed-off-by: Devika Babrekar <devika.babrekar@ibm.com>

Conflicts:
	src/pybind/mgr/dashboard/frontend/src/app/ceph/rgw/rgw-multisite-details/rgw-multisite-details.component.html
- added disabled property on table component to disable the table
	src/pybind/mgr/dashboard/frontend/src/app/shared/datatable/table-actions/table-actions.component.html
- added disabled property on table component to disable the table