Move 2.2 unit tests to 3.0 if necessary, remove 2.2 unit tests folder

[bquinn]

https://github.com/iptc/newsinjson/tree/events-planning/validation/test_suite/2.2/should_pass

It may require modifying the test runner Python script at https://github.com/iptc/newsinjson/blob/events-planning/validation/python/runtests.py

(we also noticed that there is a main.py in the folder, maybe check that the README and main.py are up to date and if main.py is needed at all??)

[iyoung]

Hi @bquinn I've added these changes in #210 if you get the chance to review. I think we should squash merge these vs just a merge to tidy the history if that's ok.