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CONTAP-708700: Potential data loss during ANDU from ONTAP 9.19.1 RC1 to 9.19.1 GA on clusters with SnapMirror Synchronous (SM-S)

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Issue

During an automated non-disruptive upgrade (ANDU) from ONTAP 9.19.1 RC1 to ONTAP 9.19.1 GA, the cluster temporarily operates in a mixed-version state where one node has been upgraded while the partner node is still running RC1.
On clusters with SnapMirror Synchronous (SM-S) configured, if the upgraded node experiences an unexpected failure during this window, the partner node (still on RC1) may be unable to process the upgraded node's operations and will halt. Write operations that had not yet been committed to disk at the time of the failure may be lost.

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