Capture stdout/stderr in server test and align completion timing #18
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Update the language server test cell code to use stdout/stderr. Inserts
a 100ms delay before setting the completion event to ensure we
capture the stdout/stderr, which are buffered and flushed every 10ms.
Ideally, we could flush prior to the "idle" cell-op for each cell run,
but that requires more complicated upstream change so this works for
now. We will do the same thing (maybe 50ms) in the extension front end.