DEV: Remove code deprecated by the new Reviewable API (#8023)

* Remove flag hooks and endpoints

* Remove #reject_bulk for users

* Remove code for quued_posts_controller

spec/requests/admin/users_controller_spec.rb

@@ -715,74 +715,6 @@ RSpec.describe Admin::UsersController do
     end
   end
 
-  describe '#reject_bulk' do
-    fab!(:reject_me)     { Fabricate(:user) }
-    fab!(:reject_me_too) { Fabricate(:user) }
-
-    it 'does nothing without users' do
-      delete "/admin/users/reject-bulk.json"
-      expect(response.status).to eq(200)
-      expect(User.where(id: reject_me.id).count).to eq(1)
-      expect(User.where(id: reject_me_too.id).count).to eq(1)
-    end
-
-    it "won't delete users if not allowed" do
-      sign_in(user)
-      delete "/admin/users/reject-bulk.json", params: {
-        users: [reject_me.id]
-      }
-      expect(response.status).to eq(404)
-      expect(User.where(id: reject_me.id).count).to eq(1)
-    end
-
-    it "reports successes" do
-      delete "/admin/users/reject-bulk.json", params: {
-        users: [reject_me.id, reject_me_too.id]
-      }
-
-      expect(response.status).to eq(200)
-      json = ::JSON.parse(response.body)
-      expect(json['success'].to_i).to eq(2)
-      expect(json['failed'].to_i).to eq(0)
-      expect(User.where(id: reject_me.id).count).to eq(0)
-      expect(User.where(id: reject_me_too.id).count).to eq(0)
-    end
-
-    context 'failures' do
-      it 'can handle some successes and some failures' do
-        stat = reject_me_too.user_stat
-        stat.first_post_created_at = (SiteSetting.delete_user_max_post_age.to_i + 1).days.ago
-        stat.post_count = 10
-        stat.save!
-
-        delete "/admin/users/reject-bulk.json", params: {
-          users: [reject_me.id, reject_me_too.id]
-        }
-
-        expect(response.status).to eq(200)
-        json = ::JSON.parse(response.body)
-        expect(json['success'].to_i).to eq(1)
-        expect(json['failed'].to_i).to eq(1)
-        expect(User.where(id: reject_me.id).count).to eq(0)
-        expect(User.where(id: reject_me_too.id).count).to eq(1)
-      end
-
-      it 'reports failure due to a user still having posts' do
-        Fabricate(:post, user: reject_me)
-
-        delete "/admin/users/reject-bulk.json", params: {
-          users: [reject_me.id]
-        }
-
-        expect(response.status).to eq(200)
-        json = ::JSON.parse(response.body)
-        expect(json['success'].to_i).to eq(0)
-        expect(json['failed'].to_i).to eq(1)
-        expect(User.where(id: reject_me.id).count).to eq(1)
-      end
-    end
-  end
-
   describe '#ip_info' do
     it "retrieves IP info" do
       ip = "81.2.69.142"