CRUD for bulkWrite tests should validate the expected result of a BulkWriteError. Right now we just validate that the bulkWrite failed as expected and ignore the "outcome.result" field when "outcome.error" is set.

One example is "BulkWrite continue-on-error behavior with unordered (preexisting duplicate key)".

Note that in some cases (retryable write errors for example) pymongo will raise a non-BulkWriteError exception. In those cases we cannot check the result field.