Improvements

Rook v1.15.4 is a patch release limited in scope and focusing on feature additions and bug fixes to the Ceph operator.

• core: Define empty securityContext for pods to fix CIS 5.7.3 (#14823, @prazumovsky)
• core: Fix deletion of the osd-replace-config configmap during OSD migration (#14862, @sp98)
• core: Allow removal of exporter pods from a node no longer having ceph daemons (#14854, @travisn)
• docs: Add documentation for RBD VolumeGroupSnapshot (#14845, @black-dragon74)
• csi: Disable fencing in Rook due to unreliable IPs being fenced (#14831, @Madhu-1)
• multus: Do not force delete in validation cleanup (#14820, @BlaineEXE)
• mon: Do not remove extra mon in middle of failover (#14805, @travisn)
• mds: Fix liveness probe timeout when ceph timeout is reached (#14798, @BlaineEXE)