Set up warning for data plane keys

Overview

Users need clear understanding of data plane keys

I'm calling this a bug, as the consequences of an expiring data plane key is a loss of connection to NGINX One Console. However, IMO it's a p4, as the default lifetime is one year.

Description

• Definition (in glossary). Is that good enough? Check against F5 definition, if any
• Use. While we list data plane key labels in the UI, it's up to the user to save those keys when they create them
• Whenever a data plane key is revoked, or expires, all instances which used that data plane key also loses their connection
• If a user has a data plane key (and remembered to record it), they can use it to create any kind of instance
  • They can create data plane keys when creating an instance, connecting NIC, connecting NGF (and probably other options). They can also create them with the API
  • We're setting up notifications for when:
    • Data plane keys are within 30 days of expiring
    • Data plane keys expire

Acceptance criteria

see Description