Update type of UserID on FINALIZATION_* SPs in Train

[EjPlatzer]

The type of UserID returned by the FINALIZATION_* stored procedures is currently different in Train and Prod (because of a change unrelated to 360). In Production, it was changed to an int, which is causing EF Core to fail when mapping returned results to C# objects, which causes Enrollment check in to break.

Production has been hotfixed to make Enrollment Check In work (see #996). We should investigate updating the type of UserID in Train to be consistent with Production.