Move error_list.scss to a page specific bundle

Moves the file to a page specific bundle and includes it
on the relevant page. Also combines error_tracking_list.scss
into the new page bundle.

app/assets/stylesheets/_page_specific_files.scss

@@ -11,8 +11,6 @@
 @import './pages/diff';
 @import './pages/editor';
 @import './pages/environment_logs';
-@import './pages/error_list';
-@import './pages/error_tracking_list';
 @import './pages/events';
 @import './pages/experience_level';
 @import './pages/experimental_separate_sign_up';

app/assets/stylesheets/pages/error_list.scss → app/assets/stylesheets/page_bundles/error_tracking_index.scss

+@import 'page_bundles/mixins_and_variables_and_functions';
+
 .error-list {
+  .dropdown {
+    min-width: auto;
+  }
+
   .sort-control {
     .btn {
       padding-right: 2rem;
@@ -17,7 +23,7 @@
         min-height: 68px;
 
         &:last-child {
-          background-color: $gray-10;
+          background-color: var(--gray-10, $gray-10);
 
           &::before {
             content: none !important;

app/assets/stylesheets/pages/error_tracking_list.scss

-.error-list {
-  .dropdown {
-    min-width: auto;
-  }
-}

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

 - page_title _('Errors')
+- add_page_specific_style 'page_bundles/error_tracking_index'
 
 #js-error_tracking{ data: error_tracking_data(@current_user, @project) }

config/application.rb

@@ -178,6 +178,7 @@ module Gitlab
     config.assets.precompile << "page_bundles/dev_ops_report.css"
     config.assets.precompile << "page_bundles/environments.css"
     config.assets.precompile << "page_bundles/error_tracking_details.css"
+    config.assets.precompile << "page_bundles/error_tracking_index.css"
     config.assets.precompile << "page_bundles/ide.css"
     config.assets.precompile << "page_bundles/issues_list.css"
     config.assets.precompile << "page_bundles/jira_connect.css"