DBOSFailedSqlTransactionError

[devhawk]

If a @Transaction method invokes a user-authored stored procedure that raises an exception, the db transaction is aborted even if the exception is caught in the @Transaction method. If the exception is caught and handled in the @transaction method, DBOS will fail when it attempts to write the @Transaction method return value to the transaction_outputs table because the associated db transaction has been aborted. This PR creates a DBOS specific error to throw in this situation.

Fixes #626

[qianl15]

Suggested change

	this.logger.error(`Postgres aborted the ${txn.name} transaction of Workflow ${workflowUUID}. Something, such as a stored procedure, in the database caused the transaction to abort.`);
	this.logger.error(`Postgres aborted the ${txn.name} transaction of Workflow ${workflowUUID}, but the function did not raise an exception. Please ensure that if a transaction encounters an exception it raises an exception.`);

[qianl15]

I think we want to emphasize that if a transaction aborts from an exception, we must raise an exception.

Suggested change

	this.logger.error(`Postgres aborted the ${txn.name} @Transaction of Workflow ${workflowUUID}, but the function did not raise an exception. Please ensure that if a transaction aborts from an exception, that exception is allowed to escape the @Transaction method.`);
	this.logger.error(`Postgres aborted the ${txn.name} @Transaction of Workflow ${workflowUUID}, but the function did not raise an exception. Please ensure that if a transaction aborts from an exception, it must raise an exception.`);