Investigate how to correctly map MongoDB driver exceptions to JDBC exceptions in execute methods.
Specifically:

• Determine how to handle cases where a non-MongoBulkWriteException occurs and it is unclear whether any commands were executed successfully or failed.
• Determine if we should handle EXECUTION_TIMEOUT responses via BatchUpdateException (currently we throw just SqlException) from the server. We should check if it is possible to know how many commands were executed successfully before the timeout.

Addressing the source code notes tagged with TODO-HIBERNATE-132 is in scope of this ticket.