Python: Fix `FoundryChatClient` and `FoundryAgent` silently dropping `default_headers` - #5466

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Evan Mattson (moonbox3) wants to merge 5 commits into

microsoft:mainfrom

moonbox3:agent/fix-5416-1

Commits on Apr 24, 2026

fix(#5416): forward default_headers through get_openai_client and pre-built client path

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test(foundry): integrate default_headers forwarding tests into existing suites

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review: remove dev artifact and issue-number reference from test docstring

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fix(openai): patch APP_INFO in test to avoid telemetry-disabled flakiness (#5416)

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Address review feedback for #5416: Python: [Bug]: FoundryChatClient(default_headers=...) and FoundryAgent(default_headers=...) silently drop custom headers
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