backports_required_for_multiversion_tests.yml is not blacklisting tenant migration tests from running on multiversion test suites

To blacklist tenant_migration_recipient_rollback_recovery.js test from the multiversion suites, I added (ticket, test_file) pair entry in /etc/backports_required_for_multiversion_tests.yml . Despite adding an entry for that test in backports_required_for_multiversion_tests.yml, the test still runs on multiversion suites leading to evergreen test failures.