NAS-140878 / 26.0.0-RC.1 / Extend error message for full ZFS replication when there are missing datasets (by themylogin)

[bugclerk]

Full ZFS replication fails when some of the source datasets with older snapshots are not present on the destination side.

This can happen in case of dataset rename. We do dataset renames when migrating from incus to new containers system, that's the root cause of the reported issue.

I am reluctant to try to replicate dataset renames automatically. We can try parsing zpool history, but, after all, it's just a text stream without any structure and there is no guarantee it is consistent with the real history.

Additionally, we can try matching renamed datasets by snapshots guids (snapshots guid are the same on the source and destination system). However, this will require retrieving a lot of snapshot metadata on both source and destination systems, and add unnecessary complexity for such a rare case.

Original PR: #359

[bugclerk]

Jira URL: https://ixsystems.atlassian.net/browse/NAS-140878

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