Improvements

Rook v1.8.9 is a patch release limited in scope and focusing on small feature additions and bug fixes to the Ceph operator.

• helm: Add ingressClassName field (#10093, @log1cb0mb)
• monitoring: Only set prometheus rules ownerref in same namespace (#10028, @travisn)
• osd: only set kek to env var on encryption scenario (#10035, @leseb)
• docs: Update the s3 client example for accessing RGW (#9968, @thotz)
• osd: Add NixOS specific PATHs to check for lvm2 (#9967, @nazarewk)