E2E: Rename end-to-end-tests-server to grafana-server (#44249)

* Rename to grafana-server / move scripts into new directory

* Change grafana-server step command

* Change scripts paths

* Use test grabpl version

* Update run-suite script

* Further name updates

* Update grabpl version

* Update contribute/style-guides/e2e-core.md

Co-authored-by: Maria Alexandra <239999+axelavargas@users.noreply.github.com>

Co-authored-by: Maria Alexandra <239999+axelavargas@users.noreply.github.com>

.gitignore

@@ -13,6 +13,7 @@ public/dist/tsconfig.tsbuildinfo
 /emails/dist
 /reports
 /e2e/tmp
+/scripts/grafana-server/tmp
 vendor/
 /docs/menu.yaml
 /requests
@@ -140,6 +141,9 @@ compilation-stats.json
 /e2e/benchmarks/**/results
 /e2e/build_results.zip
 
+# grafana server
+/scripts/grafana-server/server.log
+
 # a11y tests
 /pa11y-ci-results.json
 /pa11y-ci-report