[JENKINS-35697] Avoid losing the focus because ForkedBooter on MacOS when running tests

[MRamonLeon]

Added a couple of arguments to the jvm that is forked when running tests to avoid losing the focus when you run the maven tests in the background in MacOS. It's very annoying every time a fork is created you lose the focus where you were.

I manually tested with a plugin using this modified version. When the plugin run the tests, the Java icon doesn't show up anymore.

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[jglick]

This was reverted. Could try to create a safer patch. https://issues.jenkins.io/browse/JENKINS-35697