Vitest (#6219)

Port to vitest. Port everything to typescript. Remove chai, mocha and
chai-as-promised. Adds some docs.

cypress/e2e/frontend.cy.ts

@@ -1,6 +1,3 @@
-// eslint-disable-next-line node/no-unpublished-import
-import {it} from 'mocha';
-
 import {assertNoConsoleOutput, stubConsoleOutput} from '../support/utils';
 
 const PANE_DATA_MAP = {
@@ -39,7 +36,8 @@ describe('Individual pane testing', () => {
         });
     });
 
-    afterEach('Ensure no output in console', () => {
+    afterEach(() => {
+        // Ensure no output in console
         return cy.window().then(win => {
             assertNoConsoleOutput();
         });
@@ -104,7 +102,7 @@ describe('Known good state test', () => {
         );
     });
 
-    afterEach('Ensure no output in console', () => {
+    afterEach(() => {
         return cy.window().then(win => {
             assertNoConsoleOutput();
         });

cypress/tsconfig.json

@@ -3,11 +3,10 @@
   "compilerOptions": {
     /* Module resolution */
     "target": "esnext",
-    "module": "commonjs",
-    "moduleResolution": "classic",
+    "module": "es2015",
+    "moduleResolution": "bundler",
     /* Code generation */
     "typeRoots": ["../node_modules/@types"],
-    "types": ["mocha", "chai", "chai-http"],
     /* https://github.com/cypress-io/cypress/issues/26203#issuecomment-1571861397 */
     "sourceMap": false
   }