fix: more optimized caching for share target verification #52045
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Instead of caching the "validated" status per-share, instead track the latest share (by share id) that is validated.
This uses the fact that once a unique target is generated for the share, new files can't suddenly appear at the share target.
An exception to this is admin-created mount points (groupfolders, external storages, etc). So conflicts with other mount points is always done (but this is very cheap).