s/new_options/options/g

There are no 'old options' any more.

Testing Done:
unit and integration tests pass locally. Full CI baking.

Reviewed at https://rbcommons.com/s/twitter/r/1527/
Sync of https://github.com/pantsbuild/pants/commit/2ce0546514265a351688b2f826cbf20d88ee8d62