function schemaOKStatus(): [string, SerializedLucidDictionary]
For the moment, when the upstream Google Sheet is changed in such a way that the schema has changed, we simply
stop updates from happening. We do need to alert the user that this has happened, though. We also need to know when
the updates are happening properly so we can clear the error once the user has resolved the problem. Since the
only way to delete errors is to overwrite them, we simply overwrite the error to be OK on every successful
import.
Returns
[string, SerializedLucidDictionary]
The error map entry which alerts the document that this problem has been resolved.