JITL FileExistJob/JITL FileNotExistJob - the return code should be set depending on the execution result

Current Situation

• When executing the JITL FileExistJob or JITL FileNotExistJob Jobs then
  • by default, the job execution will always finish successfully, regardless of whether a file/directory was found or not.
    • the return code of a successful execution is always the same: 0
  • job execution may fail if e.g. the raise_error_if_result_set_is job argument is used
    • the return code of a failed execution is 99

Desired Behavior

• In case of successful execution the return code should be set depending on the execution result:
  • FileExistJob
    • return code=0 (file exists)
    • return code=1 (file does not exist)
  • FileNotExistJob
    • return code=0 (file does not exist)
    • return code=1 (file exists)