Works and FileSets should support to_global_id

So that you can send them to ActiveJob without writing a custom
serializer/deserializer.

curation_concerns-models/app/models/concerns/curation_concerns/file_set_behavior.rb

@@ -18,6 +18,7 @@ module FileSetBehavior
     include CurationConcerns::RequiredMetadata
     include CurationConcerns::Naming
     include Hydra::AccessControls::Embargoable
+    include GlobalID::Identification
 
     included do
       attr_accessor :file

curation_concerns-models/app/models/concerns/curation_concerns/work_behavior.rb

@@ -13,6 +13,7 @@ module CurationConcerns::WorkBehavior
   include CurationConcerns::Naming
   include CurationConcerns::RequiredMetadata
   include Hydra::AccessControls::Embargoable
+  include GlobalID::Identification
 
   included do
     property :owner, predicate: RDF::URI.new('http://opaquenamespace.org/ns/hydra/owner'), multiple: false

spec/models/file_set_spec.rb

@@ -613,4 +613,10 @@ def paranoid_edit_permissions
       end
     end
   end
+
+  describe "#to_global_id" do
+    let(:file_set) { described_class.new(id: '123') }
+    subject { file_set.to_global_id }
+    it { is_expected.to be_kind_of GlobalID }
+  end
 end

spec/models/generic_work_spec.rb

@@ -56,4 +56,10 @@
       }.to change { FileSet.count }.by(-2)
     end
   end
+
+  describe "#to_global_id" do
+    let(:work) { described_class.new(id: '123') }
+    subject { work.to_global_id }
+    it { is_expected.to be_kind_of GlobalID }
+  end
 end