feat: Change database relations for UDR and Webui

[gatici]

Description

UDR and Webui started to use second database to store authentication keys in a separate database. Besides, database integrations are changed in the charms. This PR adapts the bundles for the DB new integrations.

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that validate the behaviour of the software
• [ ] I validated that new and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules
• [ ] I have bumped the version of the library