Move EE prepend/include to the end of presenters

This moves all instances of `prepend EE::Something` and `include
EE::Something` in presenters to the last line of the corresponding file.
This pushes EE specific code further down the files, reducing the
likelihood of developers running into merge conflicts.

app/presenters/group_member_presenter.rb

 # frozen_string_literal: true
 
 class GroupMemberPresenter < MemberPresenter
-  prepend EE::GroupMemberPresenter
-
   private
 
   def admin_member_permission
@@ -17,3 +15,5 @@ class GroupMemberPresenter < MemberPresenter
     :destroy_group_member
   end
 end
+
+GroupMemberPresenter.prepend(EE::GroupMemberPresenter)

app/presenters/member_presenter.rb

 # frozen_string_literal: true
 
 class MemberPresenter < Gitlab::View::Presenter::Delegated
-  prepend EE::MemberPresenter
-
   presents :member
 
   def access_level_roles
@@ -40,3 +38,5 @@ class MemberPresenter < Gitlab::View::Presenter::Delegated
     raise NotImplementedError
   end
 end
+
+MemberPresenter.prepend(EE::MemberPresenter)

app/presenters/merge_request_presenter.rb

 # frozen_string_literal: true
 
 class MergeRequestPresenter < Gitlab::View::Presenter::Delegated
-  prepend EE::MergeRequestPresenter
-
   include ActionView::Helpers::UrlHelper
   include GitlabRoutingHelper
   include MarkupHelper
@@ -225,3 +223,5 @@ class MergeRequestPresenter < Gitlab::View::Presenter::Delegated
     can?(current_user, :fork_project, project)
   end
 end
+
+MergeRequestPresenter.prepend(EE::MergeRequestPresenter)

app/presenters/project_member_presenter.rb

 # frozen_string_literal: true
 
 class ProjectMemberPresenter < MemberPresenter
-  prepend EE::ProjectMemberPresenter
-
   private
 
   def admin_member_permission
@@ -17,3 +15,5 @@ class ProjectMemberPresenter < MemberPresenter
     :destroy_project_member
   end
 end
+
+ProjectMemberPresenter.prepend(EE::ProjectMemberPresenter)

app/presenters/project_presenter.rb

 # frozen_string_literal: true
 
 class ProjectPresenter < Gitlab::View::Presenter::Delegated
-  prepend EE::ProjectPresenter
-
   include ActionView::Helpers::NumberHelper
   include ActionView::Helpers::UrlHelper
   include GitlabRoutingHelper
@@ -320,3 +318,5 @@ class ProjectPresenter < Gitlab::View::Presenter::Delegated
     )
   end
 end
+
+ProjectPresenter.prepend(EE::ProjectPresenter)