Add hover style for copy icon in commit page header

Change hover style definition from explicit rgba value to variable

Removed style from page-header.scss that was overriding .btn styles

Add hover style for copy icon in commit page header

Change hover style definition from explicit rgba value to variable

Removed unnecessary styles on commits.scss

app/assets/stylesheets/framework/page-header.scss

@@ -46,10 +46,6 @@
     font-weight: bold;
   }
 
-  .fa-clipboard {
-    color: $dropdown-title-btn-color;
-  }
-
   .commit-info {
     &.branches {
       margin-left: 8px;

changelogs/unreleased/26787-add-copy-icon-hover-state.yml

+---
+title: Add hover style to copy icon on commit page header
+merge_request:
+author: Ryan Harris