Provide applicable error message when a Jira integration can't authenticate due to a captcha challenge issue

When attempting to set up a Jira integration, authentication can fail with a 403: CAPTCHA_CHALLENGE error we can see in the logs, but there is no applicable message on the integration-set up screen. It just says "We could not connect to your Jira account. Please check your server URL, username or password and try again..."

No matter how many times someone tries, they can't proceed until they log in directly in Jira to clear the captcha.

It would be helpful to give these instructions to the user.