ci: Ensure that eslint runs on all frontend code (no-changelog) (#4602)

* 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

packages/@n8n_io/eslint-config/base.js

@@ -9,11 +9,9 @@ const config = (module.exports = {
 	},
 
 	ignorePatterns: [
-		'.eslintrc.js', // TODO: remove this
 		'node_modules/**',
 		'dist/**',
 		'test/**', // TODO: remove this
-		'jest.config.js', // TODO: remove this
 	],
 
 	plugins: [