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

tsconfig.json

@@ -34,5 +34,11 @@
     },
     "skipLibCheck": true
   },
-  "include": ["public/app/**/*.ts", "public/app/**/*.tsx", "public/test/**/*.ts", "public/vendor/**/*.ts"]
+  "include": [
+    "public/app/**/*.ts",
+    "public/app/**/*.tsx",
+    "public/test/**/*.ts",
+    "public/vendor/**/*.ts",
+    "public/e2e-test/**/*.ts"
+  ]
 }