move eslint, sass, cypress packages to devDeps (#973)

I find these packages belong in devDeps not deps, because it's either
build-only or test related

## Launch Checklist

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checklist. -->


 - [ ] Briefly describe the changes in this PR.
 - [ ] Link to related issues.
- [ ] Include before/after visuals or gifs if this PR includes visual
changes.
 - [ ] Write tests for all new functionality.
 - [ ] Add an entry to `CHANGELOG.md` under the `## main` section.

Author: birkskyum