[CONFSERVER-5581] Migrate Confluence to use Polis - Create and track feature requests for Atlassian products.

Feedback Policy:

We collect Confluence feedback from various sources, and we evaluate what we've collected when planning our product roadmap. To understand how this piece of feedback will be reviewed, see our Implementation of New Features Policy.

Atlassian User has been open sourced and will now be known as 'Polis'.

One of the main improvements that has already gone into Polis is significantly easier configuration. (multiple LDAP repositories for example).