[server] Migration for soft launch
[server] Migration for soft launch

Summary:
This migration is meant to touch every single thread, since I've changed thread permissions for pretty much everything.

I've tried to make the code self-documenting, but let me know if you have any questions!

Test Plan: Will be tested in combination with following diffs

Reviewers: atul

Reviewed By: atul

Subscribers: KatPo, palys-swm, Adrian

Differential Revision: https://phabricator.ashoat.com/D1247

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