fix: Handle non-tty scenario correctly for aks agent evals

[nilo19]

---

• Fix stdin reading hang in CI/CD pipelines by using select with timeout for non-interactive mode.
• Update pytest marker registration and fix datetime.utcnow() deprecation warning in tests.
• Improve test framework with real-time stderr output visibility and subprocess timeout.

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Related command

az aks agent

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[azure-client-tools-bot-prd]

️✔️Azure CLI Extensions Breaking Change Test

️✔️Non Breaking Changes

[azure-client-tools-bot-prd]

Hi @nilo19,
Please write the description of changes which can be perceived by customers into HISTORY.rst.
If you want to release a new extension version, please update the version in setup.py as well.

[yonzhan]

Thank you for your contribution! We will review the pull request and get back to you soon.

[github-actions]

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[Copilot]

Pull Request Overview

This PR fixes stdin reading issues in CI/CD pipelines for the AKS agent by implementing timeout protection and proper non-interactive mode handling. It also updates the test framework with better debugging capabilities and addresses deprecation warnings.

• Fixes stdin reading hang in non-interactive environments using select with timeout
• Improves test framework with real-time output visibility and subprocess timeouts
• Updates pytest configuration and addresses datetime deprecation warnings

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
src/aks-agent/setup.cfg	Adds pytest marker registration for AKS agent evaluation test categories
src/aks-agent/azext_aks_agent/tests/evals/test_ask_agent.py	Enhances test framework with real-time logging, subprocess timeouts, and replaces deprecated datetime.utcnow()
src/aks-agent/azext_aks_agent/agent/agent.py	Implements select-based timeout protection for stdin reading to prevent hangs in CI/CD

[github-actions]

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