Allow FETCH PARTITION when there are broken

Why it matters

This feature addresses the issue where FETCH PARTITION could not be executed on replicated MergeTree tables when there were broken disks present. By enabling this command despite disk failures, it improves data recovery capabilities and enhances maintenance flexibility for users managing replicated MergeTree tables with hardware issues.

How to use it

Users can continue to run the FETCH PARTITION statement on replicated MergeTree tables as usual. The command now works even if some disks are detected as broken, without requiring additional configuration.