mgr/dashboard: Searchable objects for table

mgr/dashboard: Searchable objects for table

The table can now search through objects, by default it won't search
through them, but it won't fail like before.

The RBD list page is now capable of searching through objects, which
only exist on an RBD that was cloned from a snapshot.

Fixes: https://tracker.ceph.com/issues/42480
Signed-off-by: Stephan Müller <smueller@suse.com>
(cherry picked from commit 31ea95946497afa6a46a6322ef48dea9729134d4)

 Conflicts:
	src/pybind/mgr/dashboard/frontend/src/app/shared/datatable/table/table.component.spec.ts