* Introduce preLogoutHooks in authn service
* Add gcom_logout_hook
* Config the api token from the Grafana config file
* Simplify
* Add tests for logout hook
* Clean up
* Update
* Address PR comment
* Fix
* Authn: Resolve authenticate by and auth id when fethcing signed in user
* Change logout client interface to only take Requester interface
* Session: Fetch external auth info when authenticating sessions
* Use authenticated by from identity
* Move call to get auth-info into session client and use GetAuthenticatedBy in various places