Remove torchhub test (#17097)

.github/workflows/github-torch-hub.yml

-name: Torch hub integration
-
-on:
-  push:
-    branches:
-      - "*"
-
-jobs:
-  torch_hub_integration:
-    runs-on: ubuntu-latest
-    env:
-      # TODO quickfix but may need more investigation
-      ACTIONS_ALLOW_UNSECURE_COMMANDS: True
-    steps:
-    # no checkout necessary here.
-    - name: Extract branch name
-      run: echo "::set-env name=BRANCH::${GITHUB_REF#refs/heads/}"
-    - name: Check branch name
-      run: echo $BRANCH
-    - name: Set up Python
-      uses: actions/setup-python@v1
-      with:
-        python-version: 3.7
-
-    - name: Load cached virtual environment
-      uses: actions/cache@v2
-      id: cache
-      with:
-        path: ~/venv/
-        key: v1-torch_hub-${{ hashFiles('setup.py') }}
-
-    - name: Create virtual environment on cache miss
-      if: steps.cache.outputs.cache-hit != 'true'
-      run: |
-        python -m venv ~/venv && . ~/venv/bin/activate
-        pip install --upgrade pip
-
-    - name: Install dependencies
-      run: |
-        . ~/venv/bin/activate
-        # install torch-hub specific dependencies
-        pip install -e git+https://github.com/huggingface/transformers.git#egg=transformers[torchhub]
-        # no longer needed
-        pip uninstall -y transformers
-
-    #- name: Torch hub list
-    #  run: |
-    #    python -c "import torch; print(torch.hub.list('huggingface/transformers:$BRANCH'))"
-
-    #- name: Torch hub help
-    #  run: |
-    #    python -c "import torch; print(torch.hub.help('huggingface/transformers:$BRANCH', 'modelForSequenceClassification'))"