ceph: update cephobjectstore monitoring logic
ceph: update cephobjectstore monitoring logic

currently, cephobjectstore monitoring is never
stopped for the following flow:
 1. objectstore is deleted
 2. go routine is stopped
 3. objectstore is created
 4. objectstore is deleted
so, removing clusterResourceDeleted flag and
working with the map only.

Signed-off-by: subhamkrai <dd45ac319f78968c4c5ec38d47bf37f08ab3938d@gmail.com>

rook/nfs,rook/rook,rook/rook,rook/nfs,rook/rook,rook/nfs,rook/rook,rook/rook