[identity] Delete unauthenticated UploadOneTimeKeys RPC
Summary:
We have UploadOneTimeKeys in both authenticated and unauthenticated proto. I've removed the unauthenticated one and changed the usages to use the authenticated one.
I was curious why this wasn't done earlier, see: https://phab.comm.dev/D9059#267156
Test Plan: Ran Commtest tests changing its endpoint to use the authenticated one.
Reviewers: varun
Reviewed By: varun
Subscribers: ashoat, tomek
Differential Revision: https://phab.comm.dev/D9928