CI: Run e2e tests in parallel using multiple suites (#41748)

* Split suite1 to multiple e2e test suites

* Update drone yaml

* Add missing arg

* Extract cypress install step

* Change image on e2e tests step

* Sync with main

* Add cypress cache volume

* Try with grafana/ci-e2e:12.19.0-1 image

* Update grabpl version to 2.7.2

* Revert a11y failure back to 'always'

e2e/shared/tsconfig.json

@@ -0,0 +1,5 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["**/*.ts", "../../packages/grafana-e2e/cypress/support/index.d.ts"],
+  "resolveJsonModule": true
+}