[Dineshsuriya D (droideronline)]

Motivation & Context

configure_otel_providers attaches an OTel LoggingHandler to the agent_framework logger. When an application also has an OTel LoggingHandler on the root logger (for example to export its own, httpx and azure logs), agent_framework records propagate to root and are exported twice. The adjacent comment also said "root logger" while the code attaches to agent_framework.

Description & Review Guide

• What are the major changes? In _configure_providers, skip adding the handler when the root logger already has an OTel LoggingHandler, and fix the comment. Added a test covering both the root-handler-present and absent cases.
• What is the impact of these changes? Records are exported once when the app attaches its root handler before calling configure_otel_providers. Behavior is unchanged when there is no root OTel handler.
• What do you want reviewers to focus on? The check only sees a root handler that exists at configure time; an app that adds one afterwards still gets duplicates. It also does not compare logger providers, so a root handler bound to a different provider would suppress MAF's own handler.

Related Issue

Fixes #9896

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