Remove remaining references to model.NewXX (#28678)

And we remove the deprecated functions to force uses
only of the new function.
```release-note
NONE
```

server/public/model/config.go

@@ -808,7 +808,7 @@ func (s *ServiceSettings) SetDefaults(isUpdate bool) {
 	}
 
 	if s.EnableAPIPostDeletion == nil {
-		s.EnableAPIPostDeletion = NewBool(false)
+		s.EnableAPIPostDeletion = NewPointer(false)
 	}
 
 	if s.EnableAPIChannelDeletion == nil {
@@ -1141,7 +1141,7 @@ func (s *ExperimentalSettings) SetDefaults() {
 	}
 
 	if s.YoutubeReferrerPolicy == nil {
-		s.YoutubeReferrerPolicy = NewBool(false)
+		s.YoutubeReferrerPolicy = NewPointer(false)
 	}
 }