This does the same as NODE_USE_ENV_PROXY. When both are set,
like other options that can be configured from both sides,
the CLI flag takes precedence.
PR-URL: https://github.com/nodejs/node/pull/59151
Fixes: https://github.com/nodejs/node/issues/59100
Reviewed-By: Ilyas Shabi <ilyasshabi94@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
