Adds background color for disabled state to merge when succeeds dropdown

Adds MR id to changelog entry

Fix caret color

Remove duplicated semicolon

app/assets/stylesheets/pages/merge_requests.scss

@@ -21,6 +21,14 @@
       display: inline-block;
       float: left;
 
+      .btn-success.dropdown-toggle .fa {
+        color: inherit;
+      }
+
+      .btn-success.dropdown-toggle:disabled {
+        background-color: $gl-success;
+      }
+
       .accept_merge_request {
         &.ci-pending,
         &.ci-running {

changelogs/unreleased/25905-mr-when-succeeds-dropdown.yml

+---
+title: Adds background color for disabled state to merge when succeeds dropdown
+merge_request: 8222
+author: