Merge branch 'ee-6353-pipelines-index' into 'master'

EE: Removes EE differences for pipelines/index.html

See merge request gitlab-org/gitlab-ee!10152

app/views/projects/pipelines/index.html.haml

 - @no_container = true
 - page_title _('Pipelines')
 
-= content_for :flash_message do
-  = render 'shared/shared_runners_minutes_limit', project: @project
+= render_if_exists "shared/shared_runners_minutes_limit_flash_message"
 
 %div{ 'class' => container_class }
   #pipelines-list-vue{ data: { endpoint: project_pipelines_path(@project, format: :json),

ee/app/views/shared/_shared_runners_minutes_limit_flash_message.html.haml

+= content_for :flash_message do
+  = render 'shared/shared_runners_minutes_limit', project: @project