adding ai agents instrumentation

[M-Hietala]

Description

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• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
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Testing Guidelines

• Pull request includes test coverage for the included changes.

[Copilot]

Pull Request Overview

This PR adds additional instrumentation support for AI agents by updating the list of instrumentors.

• Add instrumentation entry for module "azure.ai.agents.telemetry"
• Retain existing instrumentation for "azure.ai.projects.telemetry.agents"

Comments suppressed due to low confidence (1)

sdk/monitor/azure-monitor-opentelemetry/azure/monitor/opentelemetry/_configure.py:285

• [nitpick] Both entries for AI agent instrumentation use the same class name 'AIAgentsInstrumentor'. Confirm that these two modules are intended to use identical instrumentation logic without causing conflicts; if there are differences, consider renaming one for clarity.

        ("azure.ai.agents.telemetry", "AIAgentsInstrumentor"),

[azure-sdk]

API change check

API changes are not detected in this pull request.

[lzchen]

@hectorhdzg

[lzchen]

LGTM. Any chance you can update the CHANGELOG?