Merge branch '28029-improve-blockquote-formatting-on-emails' into 'master'

Resolve "Improve blockquote formatting in notification emails"

Closes #28029

See merge request !9157

app/assets/stylesheets/mailers/highlighted_diff_email.scss

@@ -138,6 +138,13 @@ pre {
   margin: 0;
 }
 
+blockquote {
+  color: $gl-grayish-blue;
+  padding: 0 0 0 15px;
+  margin: 0;
+  border-left: 3px solid $white-dark;
+}
+
 span.highlight_word {
   background-color: $highlighted-highlight-word !important;
 }

changelogs/unreleased/28029-improve-blockquote-formatting-on-emails.yml

+---
+title: Improve blockquote formatting in notification emails
+merge_request:
+author: