Extract metrics_and_profiling CSS to page bundle

Move away from admin.css

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

+.usage-data {
+  max-height: 400px;
+}

app/assets/stylesheets/pages/admin.scss

-.usage-data {
-  max-height: 400px;
-}
-
 [data-page='admin:jobs:index'] {
   .admin-builds-table {
     td:last-child {

app/views/admin/application_settings/metrics_and_profiling.html.haml

+- add_page_specific_style 'page_bundles/admin/application_settings_metrics_and_profiling'
+
 - breadcrumb_title _("Metrics and profiling")
 - page_title _("Metrics and profiling")
 - @content_class = "limit-container-width" unless fluid_layout

config/application.rb

@@ -176,6 +176,7 @@ module Gitlab
     config.assets.precompile << "notify.css"
     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/alert_management_details.css"
     config.assets.precompile << "page_bundles/alert_management_settings.css"
     config.assets.precompile << "page_bundles/boards.css"