Display cluster environment in serverless function list view

Problem to solve

Users could have the same function name in multiple cluster environments. We need a way to display this to the user in the function index view.

Further details

(Include use cases, benefits, and/or goals)

Proposal

Group functions by environment:

What does success look like, and how can we measure that?

(If no way to measure success, link to an issue that will implement a way to measure this)

Links / references