Update upstream

[GulajavaMinistudio]

A whitelist is available so that some tests can be allowed to always succeed.
This is used only for ajax for now as it can be manually disabled in IE but
is enabled by default.

Closes jquerygh-4052

Summary

Checklist

• All authors have signed the CLA at https://cla.js.foundation/jquery/jquery
• New tests have been added to show the fix or feature works
• Grunt build and unit tests pass locally with these changes
• If needed, a docs issue/PR was created at https://github.com/jquery/api.jquery.com