Remove GitHub Actions test workflow

Local testing is more reliable due to ComfyUI/torch dependency requirements.
CI environment cannot properly mock these dependencies.

.github/workflows/test.yml

@@ -1,43 +0,0 @@
-name: Tests
-
-on:
-  push:
-    branches: [main]
-  pull_request:
-    branches: [main]
-
-jobs:
-  test:
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        python-version: ['3.10', '3.11', '3.12']
-
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5
-        with:
-          python-version: ${{ matrix.python-version }}
-
-      - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install pytest pytest-cov ruff
-          pip install -r requirements-nodes.txt
-
-      - name: Run tests
-        run: |
-          pytest tests/ -v --cov=shared --cov=nodes --cov-report=xml --cov-report=term-missing
-
-      - name: Lint with ruff
-        run: |
-          ruff check . --ignore=E501,F401 --exclude=tests/
-
-      - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v4
-        if: matrix.python-version == '3.11'
-        with:
-          files: ./coverage.xml
-          fail_ci_if_error: false