NPS Survey: Use temporary settings

Created by: umpox

Update NPS survey logic to use temporary settings

Migrates all logic around the NPS survey from localStorage to TemporarySettings.

Now the following data is tracked on a 'per-user' basis for authenticated users rather than just a 'per-device' basis:

• Number of active days for the user
• Last active date for the user
• If the user has dismissed the NPS survey
• If the user has requested to never be shown the NPS survey again.

I've attached a few comments around temporary settings below, would be interested to discuss further!