When branching, drop the code coverage section in the ci.yaml

[jrafanie]

We run code coverage stats on master only. Therefore, instead of updating the code coverage if conditional to reference the new release branch and possibly new ruby version, we should remove the code coverage section entirely.

    - name: Report code coverage
      if: "${{ github.ref == 'refs/heads/master' && matrix.ruby-version == '3.0' &&
        matrix.test-suite == 'vmdb' }}"
      continue-on-error: true
      uses: paambaati/codeclimate-action@v5

See:
ManageIQ/manageiq#22912 (comment)