Automatically remove testing code when ejecting.

[bnjmnt4n]

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[bnjmnt4n]

Just realised this doesn't work, sorry for the wrong pull request 😭

[gaearon]

Yea, unfortunately this breaks the end to end test because it is supposed to test the code after ejecting 😄 . I’d appreciate if you could look into changing our end-to-end test to kill the process when the successful compilation output is printed.