Remove in-workflow Pyodide builds from nightly and release pipelines (#9935)

Nightly and release workflows were still building Pyodide wheels inline,
despite Pyodide now being handled by a dedicated workflow. This change
removes duplicate Pyodide build work from those pipelines and aligns
artifact assembly with the new split.

- **Workflow graph cleanup**
  - Removed the `pyodide-python` job from:
    - `.github/workflows/nightly.yml`
    - `.github/workflows/release.yml`

- **Packaging dependency updates**
- Updated `python-package.needs` in both workflows to drop
`pyodide-python`, so packaging no longer waits on an in-workflow Pyodide
build.

- **Artifact collection updates**
- Removed `Download Pyodide Build` steps from both `python-package`
jobs, eliminating references to `PyodidePythonBuild`.

```yaml
python-package:
  needs:
    - mac-build-x64
    - mac-build-arm64
    - windows-build-x64
    - windows-build-x86
    - windows-build-arm64
    - manylinux-python-amd64
    - manylinux-python-arm64
    - manylinux-python-riscv64
```

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

.github/workflows/release.yml

@@ -493,58 +493,6 @@ jobs:
           path: src/api/python/wheelhouse/*.whl
           retention-days: 7
 
-  pyodide-python:
-    name: "Python bindings (Pyodide)"
-    runs-on: ubuntu-24.04
-    timeout-minutes: 90
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v7.0.0
-
-      - name: Setup packages
-        run: sudo apt-get update && sudo apt-get install -y python3-dev python3-pip python3-venv
-
-      - name: Create venv
-        run: python3 -m venv ~/env
-
-      - name: Install pyodide
-        run: ~/env/bin/pip install pyodide-build pyodide-cli
-
-      - name: Configure Emscripten
-        run: |
-          git clone https://github.com/emscripten-core/emsdk.git ~/emsdk
-          cd ~/emsdk
-          PYODIDE_EMSCRIPTEN_VERSION=$(~/env/bin/pyodide config get emscripten_version)
-          ./emsdk install ${PYODIDE_EMSCRIPTEN_VERSION}
-          ./emsdk activate ${PYODIDE_EMSCRIPTEN_VERSION}
-
-      - name: Build wheel
-        run: |
-          source ~/emsdk/emsdk_env.sh
-          cd src/api/python
-          # Exception/longjmp/bigint flags are declared in pyproject.toml and
-          # combined with Pyodide's -fwasm-exceptions defaults. Passing the
-          # legacy JS-EH -fexceptions flags here conflicts with the wasm-EH ABI.
-          ~/env/bin/pyodide build --exports whole_archive
-
-      - name: Setup env-pyodide
-        run: |
-          source ~/env/bin/activate
-          source ~/emsdk/emsdk_env.sh
-          pyodide venv ~/env-pyodide
-
-      - name: Test wheel
-        run: |
-          ~/env-pyodide/bin/pip install src/api/python/dist/*.whl
-          ~/env-pyodide/bin/python src/api/python/z3test.py z3
-
-      - name: Upload artifact
-        uses: actions/upload-artifact@v7
-        with:
-          name: PyodidePythonBuild
-          path: src/api/python/dist/*.whl
-          retention-days: 7
-
   windows-build-x64:
     name: "Windows x64 build"
     runs-on: windows-latest
@@ -752,7 +700,7 @@ jobs:
 
   python-package:
     name: "Python packaging"
-    needs: [mac-build-x64, mac-build-arm64, windows-build-x64, windows-build-x86, windows-build-arm64, manylinux-python-amd64, manylinux-python-arm64, manylinux-python-riscv64, pyodide-python]
+    needs: [mac-build-x64, mac-build-arm64, windows-build-x64, windows-build-x86, windows-build-arm64, manylinux-python-amd64, manylinux-python-arm64, manylinux-python-riscv64]
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout code
@@ -811,12 +759,6 @@ jobs:
           name: ManyLinuxPythonBuildRiscv64
           path: artifacts
 
-      - name: Download Pyodide Build
-        uses: actions/download-artifact@v8.0.1
-        with:
-          name: PyodidePythonBuild
-          path: artifacts
-
       - name: Extract builds
         run: |
           cd artifacts