This doesn’t have much impact on resulting JS size, but it will
hopefully make merge conflicts much less frequent.
The CSS growth is a little higher (6.5% increase in size) but is not
material.
If this materially reduces the number of merge conflicts we have, by
letting the git merge tools resolve some dist file mergers, I think it
would be worth it.
See https://github.com/silverstripe/silverstripe-framework/pull/6051
