Fix CsvSystemParticipantSourceTest #958
Description
CsvSystemParticipantSourceTest is broken because the tests do not fail for neither Try.Success or Try.Failure. So, if all parsing fails for whatever reason, the tests do not fail.
What could solve this is another parameter for each test shouldSucceed, so that we can match against expected successes and failures.
Also, the boolean operations within if/else don't even lead to failures, even if they result to false.