For the bulkWrite override when we are flushing a bulkWrite command there is a possibility it will fail due to network error. We cannot rely on `network_error_and_txn_override` to do this for us because we are overriding runCommand to run the bulkWrite before the original command.

We should be able to reuse logic / methods from network_error_and_txn_override but cannot rely on its existence.

This is probably actually not needed as long as we include network_error_and_txn_override after the bulkWrite override to get the retry logic