[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/pr-e2e-tests.yml

@@ -18,12 +18,12 @@ jobs:
     outputs:
       artifact: ${{ steps.artifact.outputs.artifact }}
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: actions/checkout@v4
         with:
           repository: 'grafana/grafana-build'
           ref: 'main'
           persist-credentials: false
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: actions/checkout@v4
         with:
           path: ./grafana
       - run: echo "GRAFANA_GO_VERSION=$(grep "go 1." grafana/go.work |  cut -d\  -f2)" >> "$GITHUB_ENV"