[server] Rescind notifs from fix-new-thread-types script

Summary: Ugh... having to fix the fix script. Very frustrating. Ended up spamming lots of notifs with it, hopefully this will undo those notifs.

Test Plan: test on prod!

Reviewers: atul, palys-swm

Subscribers: KatPo, zrebcu411, Adrian, subnub, karol-bisztyga

Differential Revision: https://phabricator.ashoat.com/D804