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

.github/workflows/publish-technical-documentation-next.yml

@@ -15,7 +15,7 @@ jobs:
       id-token: write
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: actions/checkout@v4
       - uses: grafana/writers-toolkit/publish-technical-documentation@publish-technical-documentation/v1 # zizmor: ignore[unpinned-uses]
         with:
           website_directory: content/docs/grafana/next