Issue Summary

Currently separate custom domain configurations are required for Jira and Confluence. 

However, attempting to append /wiki to the Jira custom domain (similar to how it works for the default URL <site-name>.atlassian.net) allows users to use the Jira DNS to access Confluence but this results in broken parts of confluence.

Steps to Reproduce

1. Create a Jira and Confluence app/site
2. Create and assign custom DNS to the Jira site e.g https://jira.abc.test.com
3. Access confluence under the custom DNS entry with path /wiki e.g https://jira.abc.test.com/wiki

Expected Results

1. Confluence should either accessible from the Jira DNS without any issues OR
2. The /wiki path should be blocked and deliver a 404 page 

Actual Results

Users are allowed to the Jira dns name with a path of /wiki to access confluence resulting in broken parts of confluence e.g images not loading

Workaround

Create a custom domain for Confluence