Change the property data types to UR data types

The test Genome/Model/Command/Import_and_Export_Metadata.t
was preloading Genome::Model::Build::Input objects which already
existed in memory.  Since PostgreSQL was returning these objects
in a different order that UR had them sorted, the Loading Iterator
concluded that a handful of them were actually deleted in the database.

The test then thought it was IMPORTING them instead of FOUND them.

Between the new support for "C" collation of text-type columns in UR::DS::Pg,
and changing the data types, that preload get() no longer deletes those
objects.
Update test diff file due to changes likely introduced in 6b3d60