Added a default User-Agent for when making requests

Santiago Facirequested to merge
T418088 into main

A default setting for axios has been set to define an User-Agent for when Test Kitchen UI makes API requests as the one that is made to Action API to fetch streams config

A new configuration property service.user_agent will be declare to define the corresponding User-Agent for Test Kitchen UI, following the same pattern already used in TestKitchen extension. The current one will be defined as Test Kitchen UI/1.2 (#experiment-platform)

Also updated config.dev.yaml and config.prod.yaml to add a couple of missing configuration properties (these files are used as examples of same files in the corresponding environments)

Bug: T418088

Edited by Santiago Faci

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