Chore: change triggering of the detect-breaking-changes Github flow (#43188)

* chore: only run the breaking-changes flow on pull requests

* chore: run the detect-breaking-changes flow on opening a PR

* chore: use

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* trying to get workflow split running.

* trying to trigger workflow.

* trying to trigger.

* Splits levitate job into two workflows.

Co-authored-by: Marcus Andersson <marcus.andersson@grafana.com>

.github/workflows/scripts/pr-get-job-link.js

@@ -0,0 +1,9 @@
+
+module.exports = async ({ github, context, core }) => {
+    const { owner, repo } = context.repo;
+    const url = `https://api.github.com/repos/${owner}/${repo}/actions/runs/${context.runId}/jobs`
+    const result = await github.request(url)
+    const link = `https://github.com/grafana/grafana/runs/${result.data.jobs[0].id}?check_suite_focus=true`;
+
+    core.setOutput('link', link);
+}