ci: remove cases.py, definitions.py, and case_validator.py from ALWAYS_RUN_ALL for smarter pruning#1328

sbryngelson merged 1 commit intoMFlowCode:masterMFlowCode/MFC:masterfrom

sbryngelson:fix/smarter-always-run-allsbryngelson/MFC:fix/smarter-always-run-allCopy head branch name to clipboard