Zhichang Yu ba552f64b9 Stabilize timeout tests with semantic assertions (#16537) ...

Replace fragile wall-clock timeout assertions with semantic checks for
deadline errors, retry suppression, and event ordering. Keep only
lower-bound timing checks where they prove backoff behavior. This
reduces CPU-load flakes without weakening regression coverage.

2026-07-02 10:56:38 +08:00

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