We have a checkLog utility library that parses log lines and can search for log ids/text/failpoint names/etc but do not have a similar one for rawMongoProgramOutput. checkLog has a 1024 log line limit so tests that generate massive logs may have to rely on rawMongoProgramOutput instead. Instead of manually parsing log lines in a jstest, we should add a utility library to cover common use cases of rawMongoProgramOutput.