Done Arbiters must follow the same voting rules as data nodes regarding configTerm and configVersion. Add unittests in topology_coordinator_v1_test.cpp.
Done Ensure we have tests that add/remove arbiters with non-force replSetReconfig. (Done in
Done Test that an arbiter gossips the config to other nodes including configTerm.
Done Count arbiters as quorum members for Config Replication. Depends on
SERVER-45085. Test: A PSA set with the secondary down can acknowledge replSetReconfig.