test_runner: do not read from process.argv and process.cwd() in run()

[MD-Mushfiqur123]

What

Move \process.argv\ and \process.cwd()\ reads out of
un()\ and into \main/test_runner.js, passing them as options instead.

Why

Closes #53867. The
un()\ function is also exposed to end users via the
ode:test\ API, so it should not depend on \process\ globals. All process-level state should be captured at the CLI entry point (\main/test_runner.js) and passed down.

How

\lib/internal/main/test_runner.js:

• Capture \process.argv\ as \options.argv\
• Capture \process.cwd()\ as \options.cwd\

\lib/internal/test_runner/runner.js:

• Replace \process.argv.slice(1)\ with \suppliedArgs\ in \getRunArgs()\
• Move \suppliedArgs\ push inside both branches to avoid duplication

The \cwd = process.cwd()\ default in
un()\ is preserved for backward compatibility when called programmatically without options.

Testing

• Existing tests should continue to pass since behavior is identical
• \main/test_runner.js\ now passes the same values that
  unner.js\ was reading directly
• CI will verify

[nodejs-github-bot]

Review requested:

• @nodejs/test_runner