Add disk failure test to validate SR and VM resilience#312

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rushikeshjadhav:feat-storage-linstor-627

Commits on May 21, 2025

Added `test_linstor_sr_fail_disk` which
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Commits on May 26, 2025

Handle scenario where if VM.start, `xcp-persistent-database` is `InUse`, are on failing disk-host, then VM.start may get stuck.
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