[Flight] don't emit chunks for rejected thenables after abort #31169
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When aborting we emit chunks for each pending task. However there was a bug where a thenable could also reject before we could flush and we end up with an extra chunk throwing off the pendingChunks bookeeping. When a task is retried we skip it if is is not in PENDING status because we understand it was completed some other way. We need to replciate this for the reject pathway on serialized thenables since aborting if effectively completing all pending tasks and not something we need to continue to do once the thenable rejects later.