Replace signed in user for identity.requester (#73750)

* Make identity.Requester available at Context

* Clean pkg/services/guardian/guardian.go

* Clean guardian provider and guardian AC

* Clean pkg/api/team.go

* Clean ctxhandler, datasources, plugin and live

* Question: what to do with the UserDisplayDTO?

* Clean dashboards and guardian

* Remove identity.Requester from ReqContext

* Implement NewUserDisplayDTOFromRequester

* Fix tests

* Change status code numbers for http constants

* Upgrade signature of ngalert services

* log parsing errors instead of throwing error

* Fix tests and add logs

* linting

pkg/services/live/pushws/push_pipeline.go

@@ -71,7 +71,7 @@ func (s *PipelinePushHandler) ServeHTTP(rw http.ResponseWriter, r *http.Request)
 			"bodyLength", len(body),
 		)
 
-		ruleFound, err := s.pipeline.ProcessInput(r.Context(), user.OrgID, channelID, body)
+		ruleFound, err := s.pipeline.ProcessInput(r.Context(), user.GetOrgID(), channelID, body)
 		if err != nil {
 			logger.Error("Pipeline input processing error", "error", err, "body", string(body))
 			return

pkg/services/live/pushws/push_stream.go

@@ -67,7 +67,7 @@ func (s *Handler) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
 			break
 		}
 
-		stream, err := s.managedStreamRunner.GetOrCreateStream(user.OrgID, liveDto.ScopeStream, streamID)
+		stream, err := s.managedStreamRunner.GetOrCreateStream(user.GetOrgID(), liveDto.ScopeStream, streamID)
 		if err != nil {
 			logger.Error("Error getting stream", "error", err)
 			continue