[Bug]: Go harness last dataWriter/timerWriter send errors are not wrapped #40405

What happened?

dataWriter/timerWriter wrap their Flush errors with errors.Wrapf:

errors.Wrapf(err, "dataWriter[%v;%v].Close: error flushing buffer of length %d", w.id, w.ch.id, l)

The last send is not wrapped and w.id and w.ch.id never show up on that error.

Issue Priority

Priority: 2 (default / most bugs should be filed as P2)

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