[release-12.0.4] CloudMigrations: Report on prem event with grafana version (#109331)

CloudMigrations: Report on prem event with grafana version (#104515)

* grafana version in on prem event report

* store grafana version in cloud migration service

(cherry picked from commit ee99433c65)

Co-authored-by: Dana Axinte <53751979+dana-axinte@users.noreply.github.com>

pkg/services/cloudmigration/gmsclient/dtos.go

@@ -51,6 +51,7 @@ type EventRequestDTO struct {
 	Error              string         `json:"error"`
 	DurationIfFinished time.Duration  `json:"duration"`
 	UserUID            string         `json:"userUid"`
+	GrafanaVersion     string         `json:"grafanaVersion"`
 }
 
 type LocalEventType string