src: simplify JS Array creation

Use `ToV8Value()` where appropriate to reduce duplication
and avoid extra `Array::Set()` calls.

PR-URL: https://github.com/nodejs/node/pull/25288


Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>