trunk/66b1a1b348188280e1f75019d2b938d2913f61b3: [distributed] Shorten explicitly failing store waits (#197630)

发生了什么

Use one-millisecond waits for absent keys and missing barrier participants. Successful operations retain their original timeouts; assertions and backend coverage are unchanged. Test plan: Source build and targeted lint pass. All eight affected tests pass: baseline 3.312s, patched 2.166s, repeats 2.112s/2.115s/2.107s. Pull Request resolved: #197630 Approved by: https://github.com/pytorchgreenlight ghstack dependencie…

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