Decide on an authentication mechanism for UI analytics

[Kekoa Kaaikala]

Spike

Investigate the different options for authentication into Kafka.
Originates from #3684
The prototype, for reference

Objective

Determine how the UI will authenticate to the Kafka broker. Keep in mind that the UI will need credentials, so this should include how the credentials are stored in the Island build.

Output

Create an issue to implement Kafka authentication into the UI.