mongos retry logic doesn't match driver's spec

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      SERVER-42908 added the RetriableError category but that included WriteConcernFailed error (until SERVER-41245) which is not in the driver's spec. Unlike driver's retryable write spec, mongos seems to always retry on WriteConcernFailed error (e.g. this unittest).

      This ticket is to investigate whether mongos should retry on WriteConcernFailed error and finish this TODO.

              Assignee:
              Randolph Tan
              Reporter:
              Lingzhi Deng
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