Adds GitHub Enterprise data-residency support to the existing bundled GitHub Copilot provider.
Maintainer proof:
- GitHub CI green on head 54010a6538f1543a7fcf161f0c46169bf059213b
- `check-lint`, `check-additional-extension-bundled`, and `check-shrinkwrap` passed in CI
- local `pnpm lint:extensions:bundled`, `pnpm lint`, and focused GitHub Copilot Vitest passed
- AWS Crabbox proof passed
- live microsoft.ghe.com device-flow/token-exchange/model-catalog proof passed
Co-authored-by: Tobias Oort <tobias.oort@ict.nl>
Co-authored-by: Gio Della-Libera <235387111+giodl73-repo@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
