Release 4.0.0#146
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ControllerPublishVolume previously overwrote ServerUUIDs unconditionally, silently moving an attached volume to a new node. When the subsequent ControllerUnpublishVolume for the old node found the volume no longer there, it returned success without detaching, leaving a stale VolumeAttachment that caused Multi-Attach deadlocks in production. Fix: fetch the volume before attaching. If it is attached to a different node return FailedPrecondition so the external-attacher waits for the old detach to complete first. If already attached to the requested node return idempotent success. Also add volume locks (TryAcquire/Release, already used on the node side) to DeleteVolume, ControllerPublishVolume, ControllerUnpublishVolume, CreateSnapshot, and ControllerExpandVolume to prevent TOCTOU races between concurrent mutating operations on the same volume.
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