Coalesce concurrent Windows sandbox setup requests - #32864
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## Why Concurrent callers can submit the same Windows sandbox setup payload while an identical helper invocation is already running. ## What changed - Share one in-flight helper invocation among setup and refresh requests with identical serialized payloads. - Return the shared success or failure to every waiter while preserving structured setup error codes, then allow subsequent requests to run again. ## Testing - Add a concurrency test that verifies identical requests execute the setup operation once. GitOrigin-RevId: 18ebbcb9b36de3eb5912b8bbbe153d39328b5e48
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Coalesce concurrent Windows sandbox setup requests
Why
Concurrent callers can submit the same Windows sandbox setup payload while an
identical helper invocation is already running.
What changed
identical serialized payloads.
structured setup error codes, then allow subsequent requests to run again.
Testing
operation once.