Chore(cypress): Review and Fix tests failing on master (#26954)

e2e-tests/cypress/tests/fixtures/markdown/markdown_code_block.html

@@ -1 +1 @@
-<h3 class="markdown__heading">Code Blocks</h3><div class="post-code post-code--wrap"><div class="post-code__overlay"><span class="post-code__clipboard"><i role="button" class="icon icon-content-copy"></i></span></div><div class="hljs"><code>This text should render in a code block</code></div></div>
+<h3 class="markdown__heading">Code Blocks</h3><div class="post-code post-code--wrap"><div class="post-code__overlay"><span class="post-code__clipboard" aria-label="Copy code" role="button"><i class="icon icon-content-copy"></i></span></div><div class="hljs"><code>This text should render in a code block</code></div></div>