Remove migration logic from document folder to application folder #4033
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We used to store files in document folder (more than 2 years ago) and had migration logic that if document folder exist, move the content to application folder.
Remove the migration logic since the majority of the users already store data in the application folder. The data we wrote in the disks are plist file and cached non-ack mcs channel message IDs, which are not critical information even if a very old user still kept the document folder (who hasn't opened his app for more than 2 years).
Also remove production code that is only used for testing, should expose the method through category instead.