PLT-2664 Split out push notifications from email notifications (#3049)

* Split out push and email notification logic, always send push notifications on mention

* Add user setting to control push notifications

* Minor changeto simplify code

utils/config.go

@@ -219,6 +219,7 @@ func getClientConfig(c *model.Config) map[string]string {
 	props["EnableDeveloper"] = strconv.FormatBool(*c.ServiceSettings.EnableDeveloper)
 
 	props["SendEmailNotifications"] = strconv.FormatBool(c.EmailSettings.SendEmailNotifications)
+	props["SendPushNotifications"] = strconv.FormatBool(*c.EmailSettings.SendPushNotifications)
 	props["EnableSignUpWithEmail"] = strconv.FormatBool(c.EmailSettings.EnableSignUpWithEmail)
 	props["EnableSignInWithEmail"] = strconv.FormatBool(*c.EmailSettings.EnableSignInWithEmail)
 	props["EnableSignInWithUsername"] = strconv.FormatBool(*c.EmailSettings.EnableSignInWithUsername)