Evergreen API provides project_identifier field to reference the "real" project name in 5.0: https://evergreen.mongodb.com/rest/v2/tasks/mongodb_mongo_v5.0_enterprise_rhel_80_64_bit_archive_dist_test_2b0d538db8c0c9b9d7992d4489ba7171c721dfb7_21_09_02_18_49_46

project_id worked fine for 4.4 and master projects because it also contained "real" project name before:
https://evergreen.mongodb.com/rest/v2/tasks/mongodb_mongo_v4.4_enterprise_rhel_80_64_bit_compile_83b8bb8b6b325d8d8d3dfd2ad9f744bdad7d6ca0_21_07_28_19_54_00
https://evergreen.mongodb.com/rest/v2/tasks/mongodb_mongo_master_enterprise_rhel_80_64_bit_archive_dist_test_911e585044f76bb244f425066bfcb838e9dfb258_21_06_02_01_18_12

And now we need to update this in setup multiversion since we want to introduce 5.0 branch for jstestfuzz self tests (TIG-3280)