feat: add support for xblock 2

.github/workflows/unit-tests.yml

@@ -12,6 +12,7 @@ jobs:
     if: (github.repository == 'edx/edx-platform-private') || (github.repository == 'openedx/edx-platform' && (startsWith(github.base_ref, 'open-release') == false))
     runs-on: [ edx-platform-runner ]
     strategy:
+      fail-fast: false
       matrix:
         python-version:
           - "3.8"