Currently, no PDB files are captured for the unit tests:
https://evergreen.mongodb.com/task_log_raw/mongodb_mongo_master_windows_64_2k8_debug_unittests_18a3e230c7d1d1cbe3e54e584c7dcc8c9052b422_19_08_20_20_35_36/0?type=T

In the log above, the files are generated, but are not captured in any tgz files, nor are they subsequently deleted by the "remove files" stage. The lack of PDB files makes minidumps unuseful for any diagnosis, so we should stop wasting resources generating and storing them.