Remove 200kb of CSS from sidebar Edit buttons

Adding no additional styles means there are some
slight inconsistencies in active/focus states, but
no more than there already are with the mix of plain
links, gl-links, gl-buttons, and other things.

app/assets/stylesheets/pages/issuable.scss

@@ -240,16 +240,6 @@
     .avatar {
       margin-left: 0;
     }
-
-    a.edit-link:not([href]):hover {
-      color: rgba($gray-normal, 0.2);
-    }
-
-    .confidential-edit,
-    .lock-edit,
-    .edit-link {
-      @extend .btn-link;
-    }
   }
 
   .cross-project-reference,

changelogs/unreleased/psi-do-not-extend-2.yml

+---
+title: Less inconsistent Edit links in sidebar
+merge_request: 43106
+author:
+type: performance