Hi there,
Each of these questions is depending on the individual plugins and GP has no control over how they are handled – you would need to check with plugin(s) support for more clarification.
I’m not sure if WordPress has guideline for plugin testing – you’d need to check with WordPress support.
GP itself doesn’t bundle with any other plugins unless you import sites from the library – we try to only choose plugins that we’ve had good experience with.
Here is a little more information about GP itself which is displayed on the home page as well:
https://www.screencast.com/t/dLd8IQrxN
Hope this helps ๐