The issue arises from the `getFreeCallCount()` function yielding the
initial value of 0. Upon instantiation of the `Worker` object, it
increments to 1. In the case of this flaky test, if the creation of the
`Worker` object is faster, the subsequent `getFreeCallCount()` call
always returns 1 instead of the expected 0.
Fixes: https://github.com/nodejs/node/issues/51003
PR-URL: https://github.com/nodejs/node/pull/51013
Reviewed-By: Vinícius Lourenço Claro Cardoso <contact@viniciusl.com.br>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
