This commit consolidates all option parsing for the test runner
in the parseCommandLine() internal helper function. The exception
is a couple of temporary flags used for feature gating which
will eventually become no-ops. This consolidation is prep work
for supporting running test files in the test runner process.
PR-URL: https://github.com/nodejs/node/pull/53849
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Chemi Atlow <chemi@atlow.co.il>