[Prototyping] Lint dashboard in pull requests (#97199)

* Make lint issues comment

* Make it work

* Delete previous comments

* Move linting to separate package

* Fix issue with refactoring

* Update test fixture

pkg/tests/apis/provisioning/testdata/github-example.yaml

@@ -17,5 +17,6 @@ spec:
     branch: dummy-branch
     branchWorkflow: true
     generateDashboardPreviews: true
+    pullRequestLinter: true
     token: "github_pat_dummy"
-    webhookSecret: "dummyWebhookSecret"
+    webhookSecret: "dummyWebhookSecret"