We currently run node on the JS wrapper around the native binaries
shipped with https://github.com/github/copilot-language-server-release.
According to their README, this is not required, and it seems like it is
just an option provided so that you can run the server with `npx`.

Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [ ] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

Closes #55891

Release Notes:

- Stopped relying on node for running the Copilot language server that
provides edit predictions. The system node version should no longer
affect whether Copilot edit predictions work in Zed