the Export behavior (renamed from CreatePkg) now provides for stackID as
another input. With this we are able to remove the additional endpoint
/api/v2/packages/stacks/:stack_id/export. It now fits into the
/api/v2/packages/export endpoint as another req body parameter. This also
makes all export functionality in teh same space, encapsulated both in the
endpoint and within the service layer :-).
references: #18646
the errors changed during the pkger http server error improvements and this
fixes it to be similar to what it once was, only now its in a flatter fashion
very similar to the pkger http server apply response.
Johnny Steenbergen