MM-12389 Update segment library to v3 (#11472)

* Update analytics-go dependency

* Migrate from segment library v2 to v3

* Reinclude gorilla/handlers module

* Fix missing module

* Remove reference to outdated analytics module

app/diagnostics.go

@@ -75,7 +75,7 @@ func (a *App) sendDailyDiagnostics(override bool) {
 }
 
 func (a *App) SendDiagnostic(event string, properties map[string]interface{}) {
-	a.Srv.diagnosticClient.Track(&analytics.Track{
+	a.Srv.diagnosticClient.Enqueue(&analytics.Track{
 		Event:      event,
 		UserId:     a.DiagnosticId(),
 		Properties: properties,