[keyserver] Add updateRolesAndPermissionsForAllThreads migration

Summary:
Now that we're at the end of the stack, this is an updateRolesAndPermissionsForAllThreads migration that will help account for changes in both D9599 and D9827

Addresses ENG-5703

Depends on D9827

Test Plan: Created some communities and roles on master, then switched to my branch and ran the migration. Confirmed that it ran successfully and the roles / permissions were correctly updated

Reviewers: atul, ginsu, ashoat

Reviewed By: ashoat

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D9945