Change hard delete process for account deletion to soft delete

[jayoshih]

Summary

Due to difficulties around account recovery, we should add a deleted BooleanField to the user model so it tracks if accounts have been deleted. It will also make it easier to deactivate user accounts if they abuse our application

Category

ENHANCEMENT

[vkWeb]

@bjester how important is this feature now? and should we think about implementing this?

[bjester]

@vkWeb Yes we can proceed with implementing this. It's a bit more than simply adding the field. We'll need to address all the ways the user is handled, whether it's FK references or implementations like authentication.

[vkWeb]

Okay, sounds good. I will work on this after I finish with search PR.