Convert milestone.scss into page specific bundle

Make CE milestone.scss page specific
Import on group and project list milestones list
Import on group and project milestone page

app/assets/stylesheets/_page_specific_files.scss

@@ -35,7 +35,6 @@
 @import './pages/members';
 @import './pages/merge_conflicts';
 @import './pages/merge_requests';
-@import './pages/milestone';
 @import './pages/monitor';
 @import './pages/note_form';
 @import './pages/notes';

app/assets/stylesheets/pages/milestone.scss → app/assets/stylesheets/page_bundles/milestone.scss

+@import 'mixins_and_variables_and_functions';
+
 $status-box-line-height: 26px;
 
 .issues-sortable-list .str-truncated {

app/views/dashboard/milestones/index.html.haml

 - @hide_top_links = true
 - page_title _('Milestones')
 - header_title _('Milestones'), dashboard_milestones_path
+= stylesheet_link_tag 'page_bundles/milestone'
 
 .page-title-holder.d-flex.align-items-center
   %h1.page-title= _('Milestones')

app/views/groups/milestones/index.html.haml

 - page_title _("Milestones")
+= stylesheet_link_tag 'page_bundles/milestone'
 
 .top-area
   = render 'shared/milestones_filter', counts: @milestone_states

app/views/groups/milestones/show.html.haml

+= stylesheet_link_tag 'page_bundles/milestone'
 = render "header_title"
 = render 'shared/milestones/top', milestone: @milestone, group: @group
 = render 'shared/milestones/tabs', milestone: @milestone, show_project_name: true

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

 - page_title _('Milestones')
+= stylesheet_link_tag 'page_bundles/milestone'
 
 .top-area
   = render 'shared/milestones_filter', counts: milestone_counts(@project.milestones)

app/views/projects/milestones/show.html.haml

@@ -2,6 +2,7 @@
 - breadcrumb_title @milestone.title
 - page_title       @milestone.title, _('Milestones')
 - page_description @milestone.description
+= stylesheet_link_tag 'page_bundles/milestone'
 
 = render 'shared/milestones/header', milestone: @milestone
 = render 'shared/milestones/description', milestone: @milestone

config/application.rb

@@ -180,6 +180,7 @@ module Gitlab
     config.assets.precompile << "page_bundles/_mixins_and_variables_and_functions.css"
     config.assets.precompile << "page_bundles/ide.css"
     config.assets.precompile << "page_bundles/jira_connect.css"
+    config.assets.precompile << "page_bundles/milestone.css"
     config.assets.precompile << "page_bundles/todos.css"
     config.assets.precompile << "page_bundles/xterm.css"
     config.assets.precompile << "performance_bar.css"