[release-12.0.1] CI: Remove zizmor workflow in favor of org workflow (#104896)

CI: Remove zizmor workflow in favor of org workflow (#104879)

* CI: Remove zizmor workflow in favor of org workflow

* Update CODEOWNERS

(cherry picked from commit 033dc19b48)

.github/workflows/zizmor.yml

@@ -1,23 +0,0 @@
-name: Zizmor GitHub Actions static analysis
-on:
-  pull_request:
-  push:
-    branches:
-      - main
-
-jobs:
-  zizmor:
-    name: Analyse with Zizmor
-
-    permissions:
-      actions: read
-      contents: read
-      # required to comment on pull requests with the results of the check
-      pull-requests: write
-      # required to upload the results to GitHub's code scanning service
-      security-events: write
-
-    uses: grafana/shared-workflows/.github/workflows/reusable-zizmor.yml@main  # zizmor: ignore[unpinned-uses]
-    with:
-      fail-severity: high
-      min-severity: high