The find_changed_files function in the mongo repo currently gets the correct result but does so backwards. It thinks all of the added files were actually deleted, which is incorrect, but then does an incorrect set operation, leading to us finding the added files anyways.

https://github.com/10gen/mongo/blob/1f8261ededebc24680a2e2c25421970968356bc5/buildscripts/patch_builds/change_data.py#L74

We should update this function to find the correct files for the correct reason.

https://parsley.mongodb.com/evergreen/mongodb_mongo_master_enterprise_rhel_80_64_bit_dynamic_all_feature_flags_required_security_patch_only_lint_fuzzer_sanity_patch_patch_8c64458511a257877e99a2e78278db1ea3bd14b8_645926439ccd4eda0bf4fb79_23_05_09_22_41_24/0/task?bookmarks=0,364&shareLine=111