TMSS-672: generic fix for models using the cached_property decorator. Use this mixin to invalidate each cached_property upon refreshing the model from the database

TMSS-261: auto_grant_ingest_permission: simulate granting ingest permission when scheduling an ingest subtask fails


(cherry picked from commit a885c014)

TMSS-668: Move retrieving of active station reservations function from dynamic scheduler to separate reservations module. Add unittests for reservations module. Add stop_time in Reservations model, and calculate duration (it was visa versa)