ci: attempt to speed up pytest by removing unnecessary dependency on pnpm

Author: asvishnyakov

.github/workflows/pytest.yaml

@@ -14,17 +14,12 @@ jobs:
       BACKEND_DIR: ./backend
     steps:
       - uses: actions/checkout@v4
-      - uses: ./.github/actions/pnpm-node-install
-        name: Install Node, pnpm and dependencies.
       - uses: ./.github/actions/uv-python-install
         name: Install Python, uv and Python dependencies
         with:
           python-version: ${{ matrix.python-version }}
           extra-dependencies: --extra tests --extra mypy --extra custom-data
           working-directory: ${{ env.BACKEND_DIR }}
-      - name: Build UI components
-        run: pnpm run buildUi
-        timeout-minutes: 5
       - name: Run Pytest
         run: uv run --no-project pytest --cov=chainlit/
         working-directory: ${{ env.BACKEND_DIR }}