E2E: Add new run modes for e2e tests (#22795)

* WIP: started e2e tests for bar gauge

* Updated

* Updated

* Updated cypress from 3.7 -> 4.1

* reverted cypress upgrade

* Updated test

* Update e2e docs

* Updated docs

.gitignore

@@ -105,5 +105,6 @@ compilation-stats.json
 /packages/grafana-e2e/cypress/videos
 /packages/grafana-e2e/cypress/logs
 /e2e/server.log
-/e2e/suite1/screenshots/received
+/e2e/suite1/screenshots
+!/e2e/suite1/screenshots/expeced/*
 /e2e/suite1/videos/*