This PR improves the Electron REPL experience. It adds a welcome message to the REPL to let users know what versions of Node.js and Electron they're running, as well as overriding the completer function in the REPL to preload and add tab autocompletion for Electron's own modules.
By default the Chromedriver will send remote-debugging-port=0 to let the
browser choose a free port to listen on. The chosen port is written to
a known file in the user data dir that is passed to the app through the
CLI.
This PR does two things.
1. Correctly passes the USER_DATA_DIR to the remote debugging server so
it knows where to write the file
2. Adds support for --user-data-dir as we did not support that CLI
argument and Chromedriver relies on being able to tell the "browser"
where to write this file.
Fixes#17354
