Add CephFS mirroring system tests for Mirror daemon component

[kdhaduk81]

This test verifies that:

1. Background IOs continue running during Mirror daemon failure operations
2. Snapshot sync is not affected by Mirror daemon failure operations
3. Cluster remains healthy after each operation
4. Clients reconnect properly after Mirror daemon failure operations

Test operations performed:

• SIGTERM: Graceful termination signal
• SIGHUP: Reload configuration signal
• SIGKILL: Forceful kill signal
• Systemctl Restart: Restart mirror daemon using systemctl restart ceph-mds@
• Node Reboot: Reboot mirror daemon nodes
• mirror daemon container restart
• mirror daemon redeploy

Logs: http://magna002.ceph.redhat.com/ceph/ceph-qe-logs/kdhaduk/logs_system_17/

[openshift-ci]

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This pull-request has been approved by: kdhaduk81
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