[Facebook] switch to Activity Log

[micahflee]

We should abandon the current approach and instead delete data from the activity log.

Tasks:

• Define all types of data (posts, comments, likes and reactions, watched videos, etc.) that we want to support
• Update the FacebookProgress object to support all of these types, and also update it on the server
• Make a bunch of different delete job types, to give the user choice in what they want to delete (e.g. they can just delete all their comments, but not their posts)
• Document a way of generating test data of every type we want to support: https://nextcloud.lockdown.systems/apps/files/files/9567?dir=/Team%20Collective/Engineering%20Notes&editing=false&openfile=true