Pass no_proxy ENV to Kubernetes service

Description

kubernetes_service passes http_proxy but not no_proxy.

Proposal

Pass no_proxy if it's set.

Links / references

ZD: https://gitlab.zendesk.com/agent/tickets/84095 (Internal Only)

Relevant code: https://gitlab.com/gitlab-org/gitlab-ce/blob/master/app/models/project_services/kubernetes_service.rb#L169-176

Documentation blurb

Bypass proxy configuration in Kubernetes

Overview

What is it? Why should someone use this feature? What is the underlying (business) problem? How do you use this feature?

Use cases

Who is this for? Provide one or more use cases.

Feature checklist

Make sure these are completed before closing the issue, with a link to the relevant commit.