MM-48651: Log error while queuing telemetry (#21821)

We didn't use to handle the error returned from the Enqueue
method. We fix that.

Additionally, we add a verbosity flag that can allow us to
look into verbose logs from the rudder client. This can
help us to debug issues regarding telemetry not being sent.

https://mattermost.atlassian.net/browse/MM-48651

```release-note
NONE
```

app/server.go

@@ -369,7 +369,7 @@ func NewServer(options ...Option) (*Server, error) {
 	})
 	s.htmlTemplateWatcher = htmlTemplateWatcher
 
-	s.telemetryService = telemetry.New(New(ServerConnector(s.Channels())), s.Store(), s.platform.SearchEngine, s.Log())
+	s.telemetryService = telemetry.New(New(ServerConnector(s.Channels())), s.Store(), s.platform.SearchEngine, s.Log(), *s.Config().LogSettings.VerboseDiagnostics)
 	s.platform.SetTelemetryId(s.TelemetryId()) // TODO: move this into platform once telemetry service moved to platform.
 
 	emailService, err := email.NewService(email.ServiceConfig{