Resolve "Update poll.js to keep polling if the status code is 2xx"

What does this MR do?

Updates poll.js to keep polling if status code is 2xx

Previously it would only keep polling if http status code was 200

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
  • Has been reviewed by a Frontend maintainer
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• If you have multiple commits, please combine them into a few logically organized commits by squashing them

What are the relevant issue numbers?

Closes #49747 (closed)