OSF: Used model.NewPointer everywhere (#27838)

```release-note
NONE
```

server/channels/app/download_test.go

@@ -19,7 +19,7 @@ func TestDownloadFromURL(t *testing.T) {
 	defer th.TearDown()
 
 	app := th.App
-	app.Config().PluginSettings.AllowInsecureDownloadURL = model.NewBool(true)
+	app.Config().PluginSettings.AllowInsecureDownloadURL = model.NewPointer(true)
 
 	// To keep track of how many times an endpoint is retried. This needs to be reset
 	// for each test run.