Revert "Add setup Python 2 step to scylla-integration-tests in GH actions"

This reverts commit 834f231.

The original reason for adding this steps to CI was for serverless 
tests, for which ccm exectues cqlsh, which required Python 2.

However looking at the 3.x branch, where the serverless tests are
routinely ran, it looks like this is not really necessary for some
reason.

Author: avelanarius

.github/workflows/[email protected]

@@ -183,11 +183,6 @@ jobs:
           java-version: '8'
           distribution: 'adopt'
 
-      - name: Setup Python 2
-        uses: actions/setup-python@v2
-        with:
-          python-version: '2.x'
-
       - name: Setup Python 3
         uses: actions/setup-python@v2
         with: