In addition:
* remove usage of LegacyEngineFacade
* extend migrations tests to check that we actually for something rather
that relying only on 'for' loop
* fix `_pickle.PicklingError: Can't pickle ...` error that occures only
on mac m1
* update u-c file
Change-Id: I6030dcc93439ad5f4786cc94707d3f0d49cf3adb