chore(copilot): use GH_HOST for Copilot endpoints and token lookup#2090

rmuir wants to merge 2 commits intoolimorris:mainolimorris/codecompanion.nvim:mainfrom

rmuir:copilot_enterprise_gh_hostrmuir/codecompanion.nvim:copilot_enterprise_gh_hostCopy head branch name to clipboard