Remove hard coding of wf details from cleanup functions

[aschroed]

• refactor of cleanup.py to get info about accepted workflow versions and run times from db and remove hard coded array
• updated find_and_release notebook to utilize this - not backward compatible
• corrected small bug in delete_wfr function that failed to cleanup errored or duplicated workflow runs on user submitted files as they are not outputs of wfrs
• removed the wfr_settings.py file as these functions are not used and info is out of date