Modified updateUserNotifyProps to directly update the field (#18097)

* Modified updateUserNotifyProps to directly update the field

The method was only being used during import and it unnecessarily
made multiple queries to the DB.

Changed to a separate query that just updated the props field.

https://community-daily.mattermost.com/plugins/focalboard/workspace/zyoahc9uapdn3xdptac6jb69ic?id=285b80a3-257d-41f6-8cf4-ed80ca9d92e5&v=495cdb4d-c13a-4992-8eb9-80cfee2819a4&c=e4f9a891-85d6-4886-8590-1e327f7f8b8f

```release-note
NONE
```

* invalidating cache

```release-note
NONE
```

store/timerlayer/timerlayer.go

@@ -9634,6 +9634,22 @@ func (s *TimerLayerUserStore) UpdateMfaSecret(userID string, secret string) erro
 	return err
 }
 
+func (s *TimerLayerUserStore) UpdateNotifyProps(userID string, props map[string]string) error {
+	start := timemodule.Now()
+
+	err := s.UserStore.UpdateNotifyProps(userID, props)
+
+	elapsed := float64(timemodule.Since(start)) / float64(timemodule.Second)
+	if s.Root.Metrics != nil {
+		success := "false"
+		if err == nil {
+			success = "true"
+		}
+		s.Root.Metrics.ObserveStoreMethodDuration("UserStore.UpdateNotifyProps", success, elapsed)
+	}
+	return err
+}
+
 func (s *TimerLayerUserStore) UpdatePassword(userID string, newPassword string) error {
 	start := timemodule.Now()