When using node:stream.pipeline or node:stream/promises.pipeline with superagent, the pipeline often fails with a 'write after end' error or with truncated data. This is because, in _pipeContinue, we are emitting 'end' as soon as the response is done. This is fine for normal requests, but for compressed content, there is an extra transform stream introduced in the pipe line. If we emit end on the agent request before the unzipObject transform stream is done writing data, pipeline will end the target stream too early and unzipObject will attempt to continue writing to the closed stream (resulting in an error, or, depending on the stream being written to, truncated data).

To fix, we make sure to emit 'end' on the agent request only after the unzipObject stream has finished writing.

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