How to hide Information Popup

I believe that, that pop-up is only displayed, when running the individual script at test step level and the script return value is not null. e.g. if your script ends with a return statement (see the Groovy Script Test Step docs for more info). Which, from my understanding and usage or Ready API only happens in development of tests.

When running the test case you do not get the pop-up.

If you really want to suppress the message you can try adding the following to the end of your Groovy Script test step:

return null

Though that does assume that you are not using the result for anything else.