[agentserver] Fix review comments for azure-ai-agentserver invoke API

[Copilot]

Addresses all automated review comments from PR #45481 introducing the azure-ai-agentserver package. Fixes bugs that would cause silent failures, incorrect HTTP semantics, and resource leaks.

Bug fixes (server/_base.py, _logger.py)

• import logging.config missing — configure_logging() silently failed with AttributeError caught by broad except
• Unsafe async generator detection — isinstance(result, AsyncGenerator) with typing.AsyncGenerator can raise TypeError at runtime; replaced with inspect.isasyncgen() / inspect.isawaitable()
• Server errors returned HTTP 400 — invoke/get/cancel exception handlers now return 500; raw str(exc) gated behind AGENT_DEBUG_ERRORS env var to prevent leaking internal details
• Response validation used request Accept header — now uses "application/json" (the actual response media type)
• Non-streaming response missing explicit content-type — added media_type="application/json" to Response()
• Unused import json — removed (Ruff F401)

Test fixes

• conftest.py fixtures — converted all httpx.AsyncClient fixtures to async generators using async with / yield to ensure proper teardown
• Inline clients in tests — replaced bare client = httpx.AsyncClient(...) with async with httpx.AsyncClient(...) as client: in test_get_cancel.py and test_openapi_validation.py
• caplog unused in test_response_validation_logs_warning — added assertion on caplog.records so the warning is actually verified
• Status code assertions — updated tests expecting 400 → 500 to match corrected server behavior

Packaging / CI

• Removed unused hard dependencies from pyproject.toml: azure-identity and azure-monitor-opentelemetry are not imported anywhere in the package
• Sample requirements.txt — removed >=1.0.0b1 version pins from all 6 sample requirements.txt files, consistent with other agentserver samples
• ci.yml — added azure-ai-agentserver to the Artifacts list so it is built, tested, and linted by the pipeline

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