Document configurable retention policies for Audit Logs, Connection Logs, and API keys. Add new data-retention.md page and update existing docs to reference it. Depends on #21021 Updates #20743
This is the final PR for moving connection logs out of the audit log and into the new connection logs page. This PR documents the feature. [preview](https://coder.com/docs/@ethan%2Fdocs-add-connection-logs/admin/monitoring/connection-logs)