Prior to the change, `USES_RAFT_CLUSTER_MANAGEMENT` feature wasn't
properly advertised upon enabling `SUPPORTS_RAFT_CLUSTER_MANAGEMENT`
raft feature.
This small series consists of 3 parts to fix the handling of supported
features for raft:
1. Move subscription for `SUPPORTS_RAFT_CLUSTER_MANAGEMENT` to the
`raft_group_registry`.
2. Update `system.local#supported_features` directly in the
`feature_service::support()` method.
3. Re-advertise gossiper state for `SUPPORTED_FEATURES` gossiper
value in the support callback within `raft_group_registry`.
* manmanson/track_supported_set_recalculation_v7:
raft: re-advertise gossiper features when raft feature support changes
raft: move tracking `SUPPORTS_RAFT_CLUSTER_MANAGEMENT` feature to raft
gms: feature_service: update `system.local#supported_features` when feature support changes
test: cql_test_env: enable features in a `seastar::thread`
cd5fec8a23