Replace bootstrap alert in jaeger page

- use gitlab ui classes
- use icon

ee/app/views/projects/tracings/show.html.haml

@@ -7,7 +7,8 @@
   %p.light= _("GitLab uses %{jaeger_link} to monitor distributed systems.").html_safe % { jaeger_link: jaeger_link }
 
   = content_for :flash_message do
-    .alert.alert-warning.flex-alert
+    .gl-alert.gl-alert-warning.flex-alert
+      = sprite_icon('warning', size: 16, css_class: 'gl-icon gl-alert-icon gl-alert-icon-no-title')
       .alert-message
         = _("Your password isn't required to view this page. If a password or any other personal details are requested, please contact your administrator to report abuse.")
 

ee/changelogs/unreleased/233688-replace-bootstrap-alert-jaeger.yml

+---
+title: Replace bootstrap alert in jaeger page
+merge_request: 41610
+author:
+type: other