e2e: upgrades Cypress to 4.50 (#24099)

* Chore: upgrades Cypress to 4.5.0

* Refactor: splits up huge it into several

* Refactor: prevent flakiness

* Refactor: updates yarn.lock

* Refactor: changes after PR comments

* Refactor: uses e2e.flows instead of import

packages/grafana-e2e/package.json

@@ -26,7 +26,7 @@
     "docsExtract": "mkdir -p ../../reports/docs && api-extractor run 2>&1 | tee ../../reports/docs/$(basename $(pwd)).log",
     "lint": "eslint cypress/ src/ --ext=.js,.ts,.tsx",
     "open": "cypress open",
-    "start": "cypress run",
+    "start": "cypress run --headless --browser chrome",
     "typecheck": "tsc --noEmit"
   },
   "devDependencies": {
@@ -48,7 +48,7 @@
     "@grafana/tsconfig": "^1.0.0-rc1",
     "blink-diff": "1.0.13",
     "commander": "5.0.0",
-    "cypress": "3.7.0",
+    "cypress": "4.5.0",
     "execa": "4.0.0",
     "ts-loader": "6.2.1",
     "typescript": "3.7.5",