[lib][native] Rename fetchNewCookieFromNativeCredentials to resolveKeyserverSessionInvalidation

Summary:
In ENG-5940, I'm working on refactoring this function.

One of the callsites will be replaced with a different function that will handle whole-app login via identity service.

The rest of the callsites will be refactored. They will continue trying to automatically log in to the keyserver, but if usingCommServicesAccessToken is set, the automatic login will be performed via the Olm auth responder instead of by using native credentials.

To reflect the new functionality, I want to start by renaming the function.

Depends on D10575

Test Plan: Flow

Reviewers: inka, varun, tomek

Reviewed By: inka

Differential Revision: https://phab.comm.dev/D10576