Fix flaky Http2 Trailers tests #60483
Merged
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Http2FrameWriter has a background task that reads from a channel, if the background task isn't actively reading from the channel, then the
context.Response.CompleteAsync()call will not run the async continuation inline and race with the channel read loop and thecontext.Features.Get<IHttpResponseTrailersFeature>().Trailers.IsReadOnlycheck.