UI: Remove background from group notifications of @mentions (#10775)

UI: Remove background from group notifications of @mentions (#10775)

This commit removes the background color from group @mention notifications. This resolves visual contrast issues when ‘unread’ styles are applied.

diff --git a/app/assets/stylesheets/common/base/group.scss b/app/assets/stylesheets/common/base/group.scss
index 642bf25..3ecab37 100644
--- a/app/assets/stylesheets/common/base/group.scss
+++ b/app/assets/stylesheets/common/base/group.scss
@@ -5,7 +5,6 @@
 span.mention-group {
   color: var(--primary-high-or-secondary-low);
   padding: 2px 4px;
-  background: rgba(var(--primary-rgb), 0.12);
   border-radius: 8px;
   font-weight: 600;
   font-size: $font-down-1;

GitHub sha: 3d1ab601

This commit appears in #10775 which was approved by eviltrout. It was merged by jordanvidrine.