R1:39237c0854fe

Set base-uri as User-Agent for OAuth1 and Github authentication

Summary: Closes T15848

Test Plan: Unclear.

Reviewers: O1 Blessed Committers, valerio.bozzolan

Reviewed By: O1 Blessed Committers, valerio.bozzolan

Subscribers: RhinosF1, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Maniphest Tasks: T15848

Differential Revision: https://we.phorge.it/D25758