[pitr] oplog slicer is paused for lock

[pitr] oplog slicer is paused for lock [Snapshot backup, opid: 692902205e216c21fa537eaf]
The oplog slicer remains paused indefinitely, preventing the backup from completing and affecting point-in-time recovery capabilities.

Steps to Reproduce:

  1. Deploy Percona MongoDB cluster in Kubernetes

  2. Create a backup schedule/trigger manual backup

  3. Monitor backup agent logs

  4. Observe the “oplog slicer is paused for lock” message

i run operator 1.21.1