* ensure that eslint runs on all frontend code
* remove tslint from `design-system`
* enable prettier and eslint-prettier for `design-system`
* Delete tslint.json
* use a single editorconfig for the repo
* enable prettier for all code in `design-system`
* more linting fixes on design-system
* ignore coverage for git and prettier
* lintfix on editor-ui
* upgrade ts-node
* move tslint and typescript to a single place
* source-map-support should be loaded in the `n8n` bin script, and not in core
* upgrade jest
* Support only node.js 14, 16, or 18
