We're not using this right now and so let's eliminate it until we've got a solid use-case. `bm_party` results -- before: ``` --------------------------------------------------------------- Benchmark Time CPU Iterations --------------------------------------------------------------- BM_PartyCreate 39.4 ns 39.4 ns 106472775 BM_AddParticipant 44.2 ns 44.2 ns 94802899 BM_WakeupParticipant 17.4 ns 17.4 ns 241990117 ``` and after: ``` --------------------------------------------------------------- Benchmark Time CPU Iterations --------------------------------------------------------------- BM_PartyCreate 37.6 ns 37.6 ns 111332125 BM_AddParticipant 40.1 ns 40.1 ns 104740937 BM_WakeupParticipant 17.3 ns 17.3 ns 242484270 ``` Closes #37036 COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/37036 from ctiller:no-after 42f396900f PiperOrigin-RevId: 646994419
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