It would be helpful to keep the contents of the database directory after a failure when running `format.sh` in Evergreen. An example of a failure where it would be useful to have data files is:
https://evergreen.mongodb.com/task/wiredtiger_ubuntu1804_stress_tests_format_stress_test_78f596e950768eb0c3224458419cb6061952d3cc_20_05_28_22_52_29/0

The format.sh script uses a different data directory for each run - and it continues on failures. I'm not sure how to get those into run directories into the artifacts.

catchsegv ./t -c /data/mci/a7cb91541fc4b9b7e74ce302f6855eaa/wiredtiger/test/format/CONFIG.stress -h /data/mci/a7cb91541fc4b9b7e74ce302f6855eaa/wiredtiger/test/format/RUNDIR.576 -1  quiet=1

We should update the script to copy the files somewhere which means they will be archived. We don't want to archive the data from all runs - that would be a prohibitively large amount of data and not generally useful.