Move expose is auditor to EE

Since auditor users are EE only,
move expose is auditor to EE file

ee/lib/ee/api/entities/user_with_admin.rb

@@ -8,6 +8,7 @@ module EE
 
         prepended do
           expose :using_license_seat?, as: :using_license_seat
+          expose :auditor, as: :is_auditor
         end
       end
     end

ee/spec/lib/ee/api/entities/user_with_admin_spec.rb

@@ -23,4 +23,17 @@ RSpec.describe ::EE::API::Entities::UserWithAdmin do
       end
     end
   end
+  context 'is_auditor' do
+    it 'returns false when user is not an auditor' do
+      expect(subject[:is_auditor]).to be false
+    end
+
+    context 'when user is an auditor' do
+      let(:user) { create(:user, :auditor) }
+
+      it 'returns true' do
+        expect(subject[:is_auditor]).to be true
+      end
+    end
+  end
 end

lib/api/entities/user_with_admin.rb

@@ -4,7 +4,6 @@ module API
   module Entities
     class UserWithAdmin < UserPublic
       expose :admin?, as: :is_admin
-      expose :auditor, as: :is_auditor
       expose :note
     end
   end

spec/requests/api/users_spec.rb

@@ -536,13 +536,6 @@ RSpec.describe API::Users do
       expect(json_response.keys).not_to include 'is_admin'
     end
 
-    it "does not return the user's `is_auditor` flag" do
-      get api("/users/#{user.id}", user)
-
-      expect(response).to match_response_schema('public_api/v4/user/basic')
-      expect(json_response.keys).not_to include 'is_auditor'
-    end
-
     it "does not return the user's `highest_role`" do
       get api("/users/#{user.id}", user)
 
@@ -589,13 +582,6 @@ RSpec.describe API::Users do
         expect(json_response['is_admin']).to be(false)
       end
 
-      it 'includes the `is_auditor` field' do
-        get api("/users/#{user.id}", admin)
-
-        expect(response).to match_response_schema('public_api/v4/user/admin')
-        expect(json_response['is_auditor']).to be(false)
-      end
-
       it "includes the `created_at` field for private users" do
         get api("/users/#{private_user.id}", admin)