e2e: Uses Cypress instead of Puppeteer (#20753)

* WIP: intial commit

* Tests: Runs e2e tests

* Refactor: Adds BASE_URL support

* Refactor: Adds namespacing

* Refactor: Cleans up the Page api

* Build: Adds to build-branches-and-prs job for testing

* Build: Hardcoded image for now

* Refactor: Uses Selectors in App

* Refactor: Adds addDataSource flow

* WIP

* Refactor: Adds e2eScenario

* Refactor: Adds add and delete scenarios

* Refactor: Adds logging

* Refactor: Adds ability to for Selectors with variables

* Refactor: Using variable selectors instead

* Refactor: Adds flow until Share Panel

* Refactor: Adds clicking on rendered image link

* Refactor: Deletes log output

* Refactor: Updates snapshots

* Chore: Reverts changes

* Refactor: Removes log plugin because maybe it breaks yarn build

* Refactor: Adds rendered image download

* Refactor: Adds image comparison

* Refactor: Removes uncaught errors override

* Refactor: Changes order of images to compare

* Refactor: Updates truth image

* Build: Updates path to CI artifacts

* Refactor: Cleaning up types and config

* wip

* Refactor: Cleans up external api

* Refactor: More cleanup

* Refactor: More cleanup

* Refactor: Removes usages of Pages and Flows

* Refactor: Removes last traces of Cypress in spec

* Refactor: Adds comments

contribute/developer-guide.md

@@ -106,10 +106,10 @@ By default, the end-to-end tests assumes Grafana is available on `localhost:3000
 BASE_URL=http://localhost:3333 yarn e2e-tests
 ```
 
-To follow the tests in the browser while they're running, add the `BROWSER` and `SLOWMO` environment variables:
+To follow the tests in the browser while they're running, use the `yarn e2e-tests:debug` instead.
 
 ```
-BROWSER=1 SLOWMO=1 yarn e2e-tests
+yarn e2e-tests:debug
 ```
 
 ## Configure Grafana for development