Re: [streams] Add tests for checking that tee() branches are errored/closed when the o... (#349)

I suspected that the close test of this PR might not work since TeeReadableStream() doesn't set fulfillment callback to reader@[[closedPromise]]. But I realized that since the branches have highWaterMark of 1, it's guaranteed that they have active reader.read() call with which they can get notified of closure as far as their queue is empty. So, no problem. Right?

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