Extract jobs_index CSS to page bundle

Move away from admin.css

app/assets/stylesheets/page_bundles/admin/jobs_index.scss

+.admin-builds-table {
+  td:last-child {
+    min-width: 120px;
+  }
+}

app/assets/stylesheets/pages/admin.scss

-[data-page='admin:jobs:index'] {
-  .admin-builds-table {
-    td:last-child {
-      min-width: 120px;
-    }
-  }
-}

app/views/admin/jobs/index.html.haml

 - add_page_specific_style 'page_bundles/ci_status'
+- add_page_specific_style 'page_bundles/admin/jobs_index'
 
 - breadcrumb_title _("Jobs")
 - page_title _("Jobs")

config/application.rb

@@ -177,6 +177,7 @@ module Gitlab
     config.assets.precompile << "mailers/*.css"
     config.assets.precompile << "page_bundles/_mixins_and_variables_and_functions.css"
     config.assets.precompile << "page_bundles/admin/application_settings_metrics_and_profiling.css"
+    config.assets.precompile << "page_bundles/admin/jobs_index.css"
     config.assets.precompile << "page_bundles/alert_management_details.css"
     config.assets.precompile << "page_bundles/alert_management_settings.css"
     config.assets.precompile << "page_bundles/boards.css"