Fixed writing pages in the same thread that does EnqueuePage #2453
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This was referenced Mar 20, 2024
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AsyncManualResetEvent was using TaskCompletionSource which by default runs continuations synchronously. That led to writing pages in the same thread that called EnqueuePage and, as a result, ~4x performance degradation.
Used more correct way to asynchronously wait for wait handle.
This partially fixes #2451