Publish docs and playground on cargo-dist release (#12079)

## Summary

These are now `post-announce-jobs`. So if they fail, the release itself
will still succeed, which seems ok. (If we make them `publish-jobs`,
then we might end up publishing to PyPI but failing the release itself
if one of these fails.)

The intent is that these are still runnable via `workflow_dispatch` too.

Closes https://github.com/astral-sh/ruff/issues/12074.

.github/workflows/release.yml

@@ -247,3 +247,21 @@ jobs:
     with:
       plan: ${{ needs.plan.outputs.val }}
     secrets: inherit
+
+  custom-publish-docs:
+    needs:
+      - plan
+      - announce
+    uses: ./.github/workflows/publish-docs.yml
+    with:
+      plan: ${{ needs.plan.outputs.val }}
+    secrets: inherit
+
+  custom-publish-playground:
+    needs:
+      - plan
+      - announce
+    uses: ./.github/workflows/publish-playground.yml
+    with:
+      plan: ${{ needs.plan.outputs.val }}
+    secrets: inherit