[EventPipe] Add Non-Lossy EventPipe Mode for gcdump#129457

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mdh1418:eventpipe-nonlossy-block

Commits on Jun 15, 2026

Add the Block (non-lossy) EventPipe buffering mode

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Commits on Jun 16, 2026

Park EventPipe producers on full buffers in Block mode

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Dispatch provider callbacks from ep_start_streaming

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Detach deferred provider callbacks under the EventPipe lock

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Commits on Jun 18, 2026