Storybook: Add basic e2e verification test (#89779)

* add very basic tests to verify storybook builds correctly

* add storybook step to drone

* reorder steps

* drone tweaks

* don't need host since it's set in env

* don't need to wait

* format build.star and readd wait

* install netcat in CI

* do a yarn install here to get correct bindings

* refactoring to hopefully work better in CI

* add wait-on

* add verbose logging

* localhost?

* more logging

* specify storybook host

* ...

* back to grafana-server

* does this work? 🤔

* run storybook e2e test after rgm-package so the backround process is running for less time

* split into separate step

* format

scripts/drone/events/pr.star

@@ -52,6 +52,10 @@ load(
     "scripts/drone/pipelines/verify_starlark.star",
     "verify_starlark",
 )
+load(
+    "scripts/drone/pipelines/verify_storybook.star",
+    "verify_storybook",
+)
 
 ver_mode = "pr"
 trigger = {
@@ -81,6 +85,12 @@ def pr_pipelines():
             ),
             ver_mode,
         ),
+        verify_storybook(
+            get_pr_trigger(
+                exclude_paths = ["pkg/**", "packaging/**", "go.sum", "go.mod"],
+            ),
+            ver_mode,
+        ),
         test_frontend(
             get_pr_trigger(
                 exclude_paths = ["pkg/**", "packaging/**", "go.sum", "go.mod"],