tests: use good executable for latency_probe test

Link: https://github.com/GeneAssembly/biosal/issues/786
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
tests: add prefix in copy command for the build artifact

Link: https://github.com/GeneAssembly/biosal/issues/786
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>