chore: Fix contact model silently discarding invalid attributes (#4994)

fixes: #4775

spec/actions/contact_identify_action_spec.rb

@@ -115,5 +115,23 @@ describe ::ContactIdentifyAction do
         expect { contact.reload }.to raise_error(ActiveRecord::RecordNotFound)
       end
     end
+
+    context 'when discard_invalid_attrs is set to false' do
+      it 'will not update the name of the existing contact' do
+        params = { email: 'blah blah blah', name: 'new name' }
+        expect do
+          described_class.new(contact: contact, params: params, retain_original_contact_name: true).perform
+        end.to raise_error(ActiveRecord::RecordInvalid)
+      end
+    end
+
+    context 'when discard_invalid_attrs is set to true' do
+      it 'will not update the name of the existing contact' do
+        params = { phone_number: 'blahblah blah', name: 'new name' }
+        described_class.new(contact: contact, params: params, discard_invalid_attrs: true).perform
+        expect(contact.reload.name).to eq 'new name'
+        expect(contact.phone_number).to eq nil
+      end
+    end
   end
 end