fix(ext/node): count MessagePort message listeners in hasMessageEventListener #23209
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The patch is expected to let the script from #23199 not exit but to write a integration test we need to introduce messagePort.off as the test should exit (is it possible to have a timeout assertion in itest?). I didn't want do that in the same PR. I'm happy to introduce the same if we need a test.
Closes #23199