Merge branch 'sunjungp-master-patch-36099' into 'master'

Resolve "Replace fa-smile-o icon with GitLab SVG slight-smile icon"

Closes #225890

See merge request gitlab-org/gitlab!36286

app/assets/stylesheets/pages/notes.scss

@@ -255,10 +255,6 @@ $note-form-margin-left: 72px;
       }
 
       &.is-loading {
-        .fa-smile-o {
-          display: none;
-        }
-
         .fa-spinner {
           display: inline-block;
         }