Moving diagnostics into a service (#14832)

* Moving diagnostics into a service

* Fixing golint checks

* Fixing tests

* Renaming from diagnostics to telemetry

* Adding missing files

* Initializing telemetry earlier in the server startup

* Fixing tests

* Adding a log for the telemetryID initialization error

* Addressing PR review comments

* Fixing merge problem

* Removing some extra Diagnostics mentions

* Making tests pass

app/security_update_check.go

@@ -49,7 +49,7 @@ func (s *Server) DoSecurityUpdateCheck() {
 
 		v := url.Values{}
 
-		v.Set(PROP_SECURITY_ID, s.diagnosticId)
+		v.Set(PROP_SECURITY_ID, s.TelemetryId())
 		v.Set(PROP_SECURITY_BUILD, model.CurrentVersion+"."+model.BuildNumber)
 		v.Set(PROP_SECURITY_ENTERPRISE_READY, model.BuildEnterpriseReady)
 		v.Set(PROP_SECURITY_DATABASE, *s.Config().SqlSettings.DriverName)