Tests: Add basic e2e tests for frontend plugin sandbox (#70759)

* Add initial e2e tests for sandboxing

* Add tests for sandbox on

* Add additional sandbox tests

* Move sandbox into various suite

* Test drone setup

* Move variable

* Update drone

* Update plugins path for e2e

* Revert drone changes

* use drone from main

* Use lib.star from main

* Move sandbox test to its own suite

* Expand methods to inject iframes

* Restore e2e script

* Add back change to script

* Update tests for trusted types

* Integrate custom plugins into grafana-server

* Echo for deubging

* add debugging message

* Expand message

* Add extra for ci

* fix path

* Improve start-server logic

* Remove duplicated logic

* Restore file deleted by mistake

* Restore file to main
p

* restore file

* Restore start script

* Update e2e/panels-suite/frontend-sandbox-panel.spec.ts

Co-authored-by: Levente Balogh <balogh.levente.hu@gmail.com>

---------

Co-authored-by: Levente Balogh <balogh.levente.hu@gmail.com>

scripts/grafana-server/start-server

@@ -34,6 +34,17 @@ mkdir $PROV_DIR/dashboards
 cp ./scripts/grafana-server/custom.ini $RUNDIR/conf/custom.ini
 cp ./conf/defaults.ini $RUNDIR/conf/defaults.ini
 
+echo -e "Copying custom plugins from e2e tests"
+
+mkdir -p "$RUNDIR/data/plugins"
+# when running in a local computer
+if [ -d "./e2e/custom-plugins" ]; then
+  cp -r "./e2e/custom-plugins" "$RUNDIR/data/plugins"
+# when running in CI
+elif [ -d "../e2e/custom-plugins" ]; then
+  cp -r "../e2e/custom-plugins" "$RUNDIR/data/plugins"
+fi
+
 echo -e "Copy provisioning setup from devenv"
 
 cp devenv/datasources.yaml $PROV_DIR/datasources
@@ -53,4 +64,3 @@ $RUNDIR/bin/"$ARCH"grafana-server \
 
 # 2>&1 > $RUNDIR/output.log &
 # cfg:log.level=debug \
-