@grafana/e2e: screenshots and panel flow (#25203)

* Cleanup

* addPanel now supports (optional) custom dashboardUid

* addPanel now supports (optional) visualization name

* Added CLI option for updating screenshot fixtures

* Added support for console.* functions within tests

* Refactored screenshot command for greater simplicity

* addPanel now sets a unique title

* Updated lockfile

packages/grafana-e2e/package.json

@@ -50,6 +50,7 @@
     "blink-diff": "1.0.13",
     "commander": "5.0.0",
     "cypress": "4.5.0",
+    "cypress-log-to-output": "^1.0.8",
     "execa": "4.0.0",
     "resolve-as-bin": "2.1.0",
     "ts-loader": "6.2.1",