Update release bash scripts

Change-Id: I7c3b520466c463499a724fa8f7f53ccaf2a4e9e5
GitOrigin-RevId: c5a87f4255ee687caa47a24fb4f2b3ea78cc0594

Update o2a converter to support Airflow 2

- Update mappers and templates for control and action nodes;
- Update requirements for supporting Airflow>=2;
- Update folder structure for o2a_libs;
- Add scripts for kokoro CI;
- Update documentation and tests;

Change-Id: I4424678f0c21044170aab65c14f9d1057bba57fe
GitOrigin-RevId: dc0a985215a4d680860199d5f28e3f99ffcfcbdb