E2E: Add performance monitoring E2E test (#109417)

* initial workflow

* add bench reporter

* add pr trigger

* update workflow

* actually add the test

* debug

.....

* more debug

* this it???

* Debugging GHA workflow

https

newline

tree

cache node modules

try bench again

fix path

* Add RequestsRecorder and tweak GHA workflow

* More debugging GHA workflow

cache

cache key

try renaming path

specify env var correctly

* Run tests on both envs, wait for requests to finish

fix status

cat stats

cat stats

* prefix metric names

* cleanup

* cleanup gha

* codeowners

* make gen-jsonnet

* quote things

* Add host_type label for categorising the various hosts

* rename pw_boot_time_seconds to pw_test_run_time_seconds

* change prefix

* codeowners, gha name

* remove node-modules caching

* fix codeowners

devenv/jsonnet/dev-dashboards.libsonnet

@@ -69,6 +69,7 @@
     "loki_fakedata": (import '../dev-dashboards/datasource-loki/loki_fakedata.json'),
     "loki_query_splitting": (import '../dev-dashboards/datasource-loki/loki_query_splitting.json'),
     "migrations": (import '../dev-dashboards/migrations/migrations.json'),
+    "mostly-blank-dashboard": (import '../dev-dashboards/scenarios/mostly-blank-dashboard.json'),
     "mssql_fakedata": (import '../dev-dashboards/datasource-mssql/mssql_fakedata.json'),
     "mssql_unittest": (import '../dev-dashboards/datasource-mssql/mssql_unittest.json'),
     "mysql_fakedata": (import '../dev-dashboards/datasource-mysql/mysql_fakedata.json'),