feat(rebuild): implement per-volume and global QoS control for replic…

[hookak]

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…a rebuilding (v2 engine)

• Adds in EngineMonitor to apply QoS during rebuilding
• Supports per-volume and global setting fallback
• Adds to to track actual QoS applied
• Updates CRD, types, and applyconfig for the new fields

Which issue(s) this PR fixes:

Issue https://github.com/longhorn/longhorn/issues/10770

What this PR does / why we need it:

• Adds support for applying replica rebuilding QoS on v2 (SPDK) engine replicas
• Introduces a global setting v2-data-engine-rebuilding-mbytes-per-second to control default bandwidth limit
• Adds a per-volume override field rebuildingMbytesPerSecond in VolumeSpec
• Ensures actual QoS application is tracked via AppliedRebuildingMbps in Engine.Status.RebuildStatus
• Updates CRD schema and generated applyconfiguration files

Special notes for your reviewer:

• If both global and per-volume values are 0, no QoS will be applied (unlimited)
• Rebuild QoS is only supported for DataEngine: v2 volumes

Additional documentation or context