Autofill sync might undelete deleted items in a very obscure edge-case

Edge case is:

• device a deletes a record.
• device b is yet to sync the deletion.
• account storage is reset (eg, password reset setting up device c)

Next time device b syncs, that deleted record will come back everywhere.

Core problem is that tombstones are removed after a sync, so can't be put on the server after a reset. I think we copied what desktop does?

┆Issue is synchronized with this Jira Task