Remove 'QA::Page::Project::Milestone::Show' which wasn't used

Signed-off-by: Rémy Coutable <remy@rymai.me>

qa/qa.rb

@@ -259,7 +259,6 @@ module QA
       module Milestone
         autoload :New, 'qa/page/project/milestone/new'
         autoload :Index, 'qa/page/project/milestone/index'
-        autoload :Show, 'qa/page/project/milestone/show'
       end
 
       module Operations

qa/qa/ee/page/project/milestone/show.rb

@@ -5,9 +5,7 @@ module QA
     module Page
       module Project
         module Milestone
-          module Show
-            def self.prepended(page)
-              page.module_eval do
+          class Show < ::QA::Page::Base
             view 'ee/app/views/shared/milestones/_burndown.html.haml' do
               element :burndown_chart
               element :weight_button
@@ -16,8 +14,6 @@ module QA
             view 'ee/app/views/shared/milestones/_weight.html.haml' do
               element :total_issue_weight_value
             end
-              end
-            end
 
             def click_weight_button
               click_element(:weight_button)

qa/qa/page/project/milestone/show.rb

-# frozen_string_literal: true
-
-module QA
-  module Page
-    module Project
-      module Milestone
-        class Show < Page::Base
-        end
-      end
-    end
-  end
-end
-
-QA::Page::Project::Milestone::Show.prepend_if_ee('QA::EE::Page::Project::Milestone::Show')

qa/qa/specs/features/ee/browser_ui/2_plan/burndown_chart/burndown_chart_spec.rb

@@ -33,7 +33,7 @@ module QA
       it 'shows burndown chart on milestone page' do
         milestone.visit!
 
-        Page::Project::Milestone::Show.perform do |show|
+        QA::EE::Page::Project::Milestone::Show.perform do |show|
           expect(show.burndown_chart).to be_visible
           expect(show.burndown_chart).to have_content("Open issues")
 

qa/qa/specs/features/ee/browser_ui/2_plan/issues_weight/issue_weight_visualization_spec.rb

@@ -41,7 +41,7 @@ module QA
           show.click_milestone_link
         end
 
-        Page::Project::Milestone::Show.perform do |show|
+        QA::EE::Page::Project::Milestone::Show.perform do |show|
           expect(show.total_issue_weight_value).to have_content(weight)
         end