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

---------

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

.github/workflows/github-release.yml

@@ -40,7 +40,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Create GitHub release (manually invoked)
-        uses: grafana/grafana-github-actions-go/github-release@main
+        uses: grafana/grafana-github-actions-go/github-release@main # zizmor: ignore[unpinned-uses]
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           version: ${{ inputs.version }}