Follow-up of request #29265. After that request, there is still a package.json at plugins/git/. It interferes with turbo's caching behaviour (from request #24241), so that if there is any change at all in the whole of the git plugin, this script will be called again to rebuild the same backend assets.

It would be better if this script was split: one package.json for the end-to-end test dependencies, and one in a sub-directory for the backend assets. This way, once built, it stays cached, unless it is changed.