Plugin extensions: Add e2e tests (#89048)

* add custom plugins

* update bundles

* provision app plugins and their dashboards

* add one more script that run e2e tests using e2e test server

* add e2e tests

* regenerate jsonnet dashboards

* ignore custom plugins and playwright report

* use minified

* cleanup tests

* update codeowners

* add leading slash

* document new script

* document custom-plugins

* cleanup

* twist modules

* add readme

scripts/grafana-server/start-server

@@ -31,6 +31,7 @@ mkdir $PROV_DIR
 mkdir $PROV_DIR/datasources
 mkdir $PROV_DIR/dashboards
 mkdir $PROV_DIR/alerting
+mkdir $PROV_DIR/plugins
 
 cp ./scripts/grafana-server/custom.ini $RUNDIR/conf/custom.ini
 cp ./conf/defaults.ini $RUNDIR/conf/defaults.ini
@@ -51,6 +52,7 @@ echo -e "Copy provisioning setup from devenv"
 cp devenv/datasources.yaml $PROV_DIR/datasources
 cp devenv/dashboards.yaml $PROV_DIR/dashboards
 cp devenv/alert_rules.yaml $PROV_DIR/alerting
+cp devenv/plugins.yaml $PROV_DIR/plugins
 
 cp -r devenv $RUNDIR