mgr/dashboard: fix performance issue when listing large amounts of buckets

mgr/dashboard: fix performance issue when listing large amounts of buckets

Fixes: https://tracker.ceph.com/issues/47543
Signed-off-by: Alfonso Martínez <almartin@redhat.com>
(cherry picked from commit 924368e1d0aebcb0d8f9747589d9048414d33080)

 Conflicts:
	src/pybind/mgr/dashboard/frontend/src/app/ceph/rgw/rgw-bucket-details/rgw-bucket-details.component.spec.ts
	src/pybind/mgr/dashboard/frontend/src/app/ceph/rgw/rgw-bucket-details/rgw-bucket-details.component.ts
	src/pybind/mgr/dashboard/frontend/src/app/shared/api/rgw-bucket.service.ts
  - Adapted changes in these files to octopus code.