CI: remove unused worklow; use GITHUB_TOKEN where possible (#104657)

* remove unused worklow; use GITHUB_TOKEN where possible

* pin usages of checkout and setup-go

* Fix zizmor errors

* add zizmor.yml

* fix `changelog.yml`

* fix `core-plugins-build-and-release.yml`

* fix `release-comms.yml`

* update release-pr.yml and run-e2e-suite.yml

* Fix errors in files outside of .github/workflows

* Remove path filter on zizmor.yml

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Co-authored-by: Sven Grossmann <svennergr@gmail.com>
Co-authored-by: joshhunt <josh.hunt@grafana.com>

.github/workflows/migrate-prs.yml

@@ -51,7 +51,7 @@ jobs:
           app_id: ${{ secrets.GRAFANA_DELIVERY_BOT_APP_ID }}
           private_key: ${{ secrets.GRAFANA_DELIVERY_BOT_APP_PEM }}
       - name: Migrate PRs
-        uses: grafana/grafana-github-actions-go/migrate-open-prs@main
+        uses: grafana/grafana-github-actions-go/migrate-open-prs@main # zizmor: ignore[unpinned-uses]
         with:
           token: ${{ steps.generate_token.outputs.token }}
           ownerRepo: ${{ inputs.ownerRepo }}