Add documentation for how to connect to GET release envs

Jason Rogena (GitLab)requested to merge
jrogena/get-release-env-connection-docs into master
  • Add documentation for how to connect to GET release envs

Add documentation for how to connect to the Kubernetes clusters as well as how to log in to release environments deployed using GET.

Closes gitlab-com/gl-infra/delivery#21326 (closed)

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