OSF: Used model.NewPointer everywhere (#27838)

```release-note
NONE
```

server/channels/app/plugin_api_test.go

@@ -2408,8 +2408,8 @@ func TestPluginServeMetrics(t *testing.T) {
 	th.App.UpdateConfig(func(cfg *model.Config) {
 		prevEnable = cfg.MetricsSettings.Enable
 		prevAddress = cfg.MetricsSettings.ListenAddress
-		cfg.MetricsSettings.Enable = model.NewBool(true)
-		cfg.MetricsSettings.ListenAddress = model.NewString(":30067")
+		cfg.MetricsSettings.Enable = model.NewPointer(true)
+		cfg.MetricsSettings.ListenAddress = model.NewPointer(":30067")
 	})
 	defer th.App.UpdateConfig(func(cfg *model.Config) {
 		cfg.MetricsSettings.Enable = prevEnable