General enhancements/cleanups to test exes (#4109)
* General enhancements/cleanups to test exes
- Support running onnxruntime_perf_test with no output file
- if you're profiling the output file is often unused and can be very large
- Allow failure to override early success if doing multiple runs of a test using running onnx_test_runner
- e.g. if the second run fails that's more important as a final status
- Clarify ownership semantics
- Cleanup naming, line lengths, usage of references for required parameters etc.
