Remove bok-choy usage

[salman2013]

Description

As the bok-choy has been deprecated openedx/public-engineering#13, we are removing its usage from the code in this PR.

Ticket : https://github.com/orgs/openedx/projects/55/views/1?pane=issue&itemId=40710452

[farhan]

1 point, rest seems good

[farhan]

@salman2013 Did you try removing the following code and its relevance from the ci.yml. I think it's only related to integration tests.

    - name: Set up test environment
      run: |
        sudo apt-get install xvfb
        wget https://github.com/mozilla/geckodriver/releases/download/v0.15.0/geckodriver-v0.15.0-linux64.tar.gz
        mkdir geckodriver
        tar -xzf geckodriver-v0.15.0-linux64.tar.gz -C geckodriver
        export PATH=$PATH:$(pwd)/geckodriver
        export BOTO_CONFIG=/dev/null

[farhan]

We should replace following
run: xvfb-run --server-args=-ac -- tox -e ${{ matrix.toxenv }}
with
run: tox -e ${{ matrix.toxenv }}