Merge branch 'ph/388125/fixMultipleCopyCodeButtons' into 'master'

Fix bug where multiple copy code buttons could exist

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/113504



Merged-by: Jose Ivan Vargas <jvargas@gitlab.com>
Approved-by: Jose Ivan Vargas <jvargas@gitlab.com>
Co-authored-by: Phil Hughes <me@iamphill.com>

app/assets/javascripts/behaviors/copy_code.js

@@ -5,6 +5,8 @@ import { setAttributes } from '~/lib/utils/dom_utils';
 
 class CopyCodeButton extends HTMLElement {
   connectedCallback() {
+    if (this.querySelector('.btn')) return;
+
     this.for = uniqueId('code-');
 
     const target = this.parentNode.querySelector('pre');