tests: add script to assemble one of the Iowa Soil files

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
tests: generate JUnit XML file for unit tests

Link: https://github.com/GeneAssembly/biosal/issues/767
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>