Tests: Adds end-to-end tests skeleton and basic smoke test scenario (#16901)

* Chore: Adds neccessary packages

* Wip: Initial dummy test in place

* Feature: Downloads Chromium if needed

* Fix: Adds global config object

* Refactor: Adds basic e2eScenario

* Build: Adds end to end tests to config

* Build: Changes end to end job

* Build: Adds browsers to image

* Build: Adds failing test

* Refactor: Adds first e2e-test scenario

* Fix: Ignores test output in gitignore

* Refactor: Adds compare screenshots ability

* Refactor: Removes unnecessary code

* Build: Removes jest-puppeteer

* Fix: Replaces test snapshots

* Refactor: Creates output dir if missing

* Refactor: Changes aria-labels to be more consistent

* Docs: Adds section about end to end tests

* Fix: Fixes snapshots

* Docs: Adds information about ENV variables

jest.config.e2e.js

@@ -0,0 +1,15 @@
+require('module-alias/register');
+
+module.exports = {
+  verbose: false,
+  transform: {
+    '^.+\\.(ts|tsx)$': 'ts-jest',
+  },
+  moduleDirectories: ['node_modules', 'public'],
+  roots: ['<rootDir>/public/e2e-test'],
+  testRegex: '(\\.|/)(test)\\.(jsx?|tsx?)$',
+  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json'],
+  setupFiles: [],
+  globals: { 'ts-jest': { isolatedModules: true } },
+  setupFilesAfterEnv: ['expect-puppeteer', '<rootDir>/public/e2e-test/install/install.ts'],
+};