fix(code-snippet): remove redundant text on icon (#12413)

closes #10528

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

Author: alisonjoseph

packages/react/src/components/CodeSnippet/CodeSnippet.js

@@ -266,7 +266,6 @@ function CodeSnippet({
             {expandCodeBtnText}
           </span>
           <ChevronDown
-            aria-label={expandCodeBtnText}
             className={`${prefix}--icon-chevron--down ${prefix}--snippet__icon`}
             name="chevron--down"
             role="img"