Filter chaining by active environment

[gschier]

https://feedback.yaak.app/p/request-chaining-and-swapping-environments

This PR adds the ability to filter HTTP responses in the response.* template functions to ones sent in the active environment.

• Add environment_id field to HttpResponse, GrpcConnection, and WebsocketConnection
• Add environment behavior selector to response.* template function config

I thought about filtering all responses in the UI by active environment as well, but don't want to break anyone's existing workflows. I still think I want to do this, but Yaak will need proper onboarding for existing users, as well as a way to disable it.