[release-12.0.1] CI: move workflows/actions to actions (#104743)

CI: move workflows/actions to actions (#104711)

* move workflows/actions to actions

* rerun actions

* fix setup-go v5

* unpinned unnecessary pins

* update CODEOWONERS

* update CODEOWONERS

* remove remove-milestone from codeowners

* remove bad key

(cherry picked from commit 2436b4e097)

.github/workflows/codeowners-validator.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       # Checks-out your repository, which is validated in the next step
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: actions/checkout@v4
         with:
           persist-credentials: false
       - name: GitHub CODEOWNERS Validator