Merge branch 'djadmin-remove-mermaid-copy-code-btn' into 'master'

Disable copy-code button for mermaid diagrams

See merge request gitlab-org/gitlab!77935

app/assets/javascripts/behaviors/copy_code.js

@@ -30,6 +30,7 @@ class CopyCodeButton extends HTMLElement {
 
 function addCodeButton() {
   [...document.querySelectorAll('pre.code.js-syntax-highlight')]
+    .filter((el) => el.attr('lang') !== 'mermaid')
     .filter((el) => !el.closest('.js-markdown-code'))
     .forEach((el) => {
       const copyCodeEl = document.createElement('copy-code');