Fixed commit list system not gradient

Closes #33896

app/assets/stylesheets/framework/timeline.scss

@@ -44,6 +44,10 @@
   &:target,
   &.target {
     background: $line-target-blue;
+
+    &.system-note .note-body .note-text.system-note-commit-list::after {
+      background: linear-gradient(rgba($line-target-blue, 0.1) -100px, $line-target-blue 100%);
+    }
   }
 
   .avatar {

app/assets/stylesheets/pages/notes.scss

@@ -250,7 +250,7 @@ ul.notes {
           &::after {
             content: '';
             width: 100%;
-            height: 67px;
+            height: 70px;
             position: absolute;
             left: 0;
             bottom: 0;