Show region as `us-east-1` instead of `us-east-1.aws`

[Flo4604]

Region is currently displayed as us-east-1.aws; it should display as us-east-1 (provider suffix not needed).

Current value comes from an env var used for routing.

[linear]

ENG-2488

[chronark]

I don't mind having the region suffix tbh

also where do you even mean? show where? in the dashboard? what page?