PLT-3168 Hide EnableFormatting advanced setting unless testing is enabled (#3237)

* Added EnableTesting to the client config

* Hid EnableFormatting advanced setting unless testing is enabled

utils/config.go

@@ -217,6 +217,7 @@ func getClientConfig(c *model.Config) map[string]string {
 	props["EnableOnlyAdminIntegrations"] = strconv.FormatBool(*c.ServiceSettings.EnableOnlyAdminIntegrations)
 	props["EnablePostUsernameOverride"] = strconv.FormatBool(c.ServiceSettings.EnablePostUsernameOverride)
 	props["EnablePostIconOverride"] = strconv.FormatBool(c.ServiceSettings.EnablePostIconOverride)
+	props["EnableTesting"] = strconv.FormatBool(c.ServiceSettings.EnableTesting)
 	props["EnableDeveloper"] = strconv.FormatBool(*c.ServiceSettings.EnableDeveloper)
 
 	props["SendEmailNotifications"] = strconv.FormatBool(c.EmailSettings.SendEmailNotifications)