Improve connection pool failure diagnostics - #4590

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mdaigle:mdaigle-evaluate-pool-3545

Azure Pipelines / sqlclient-pr (Test: linux_net9 sqlclient_manual_localhost_ae_AE_linux_net9) succeeded Aug 25, 2026 in 8m 36s

Test: linux_net9 sqlclient_manual_localhost_ae_AE_linux_net9 succeeded

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