[EngSys] Set up GitHub workflow for Copilot coding agent environment

Set up a GitHub workflow in this repository for the Copilot coding agent to have all necessary tooling in its environments.

Reference parent issue: [azure-sdk-tools#11377](https://github.com/Azure/azure-sdk-tools/issues/11377)

See: [Docs](https://docs.github.com/en/copilot/how-tos/use-copilot-agents/coding-agent/customize-the-agent-environment)
