Move export of Global ID to Guid and export Global ID field

We found that we can load a field of type of GUID to Global ID, if the Target has a Unique index and the GUID field in the file gdb has Unique index.

I propose we expose the Global ID field in the source to target dialog. We always convert Global ID to a GUID field in the export.

this will help when we are using a layer with a join

@JRosenfeldIntern