Add build-tests and build-samples Copilot skills for azure-ai-ml

Co-authored-by: l0lawrence <100643745+l0lawrence@users.noreply.github.com>
Agent-Logs-Url: https://github.com/Azure/azure-sdk-for-python/sessions/0251e294-ac53-47f5-8b23-090e8b3350da

Author: Copilot