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/design-system/src/components/N8nTree/__tests__/Tree.spec.ts

@@ -7,7 +7,7 @@ describe('components', () => {
 			const wrapper = render(N8nTree, {
 				props: {
 					value: {
-						"hello": "world",
+						hello: 'world',
 					},
 				},
 			});
@@ -18,13 +18,10 @@ describe('components', () => {
 			const wrapper = render(N8nTree, {
 				props: {
 					value: {
-						"hello": {
-							"test": "world",
+						hello: {
+							test: 'world',
 						},
-						"options": [
-							"yes",
-							"no",
-						],
+						options: ['yes', 'no'],
 					},
 				},
 			});
@@ -35,37 +32,30 @@ describe('components', () => {
 			const wrapper = render(N8nTree, {
 				props: {
 					value: {
-						"hello": {
-							"test": "world",
+						hello: {
+							test: 'world',
 						},
-						"options": [
-							"yes",
-							"no",
-						],
+						options: ['yes', 'no'],
 					},
 				},
 				slots: {
-					label: "<span>label</span>",
-					value: "<span>value</span>",
+					label: '<span>label</span>',
+					value: '<span>value</span>',
 				},
 			});
 			expect(wrapper.html()).toMatchSnapshot();
 		});
 
-
 		it('should render each tree with node class', () => {
 			const wrapper = render(N8nTree, {
 				props: {
 					value: {
-						"hello": {
-							"test": "world",
+						hello: {
+							test: 'world',
 						},
-						"options": [
-							"yes",
-							"no",
-						],
+						options: ['yes', 'no'],
 					},
-					nodeClass: "nodeClass",
+					nodeClass: 'nodeClass',
 				},
 			});
 			expect(wrapper.html()).toMatchSnapshot();