Merge pull request Expensify#62964 from callstack-internal/perf/convert-script-blocking

[Web] Convert script: Load in async

Author: srikarparsi

web/index.html

@@ -22,8 +22,7 @@
 
     <% if (htmlWebpackPlugin.options.isWeb && (htmlWebpackPlugin.options.isStaging || htmlWebpackPlugin.options.isProduction)) { %>
         <!-- begin Convert Experiences code-->
-        <script type="text/javascript" src="//cdn-4.convertexperiments.com/v1/js/10042537-100413459.js">
-        </script>
+        <script type="text/javascript" async src="//cdn-4.convertexperiments.com/v1/js/10042537-100413459.js"></script>
         <!-- end Convert Experiences code -->
     <% } %>