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b9f82f6f23
A joining node hung forever if the topology coordinator added it to the group 0 configuration before the node reached `post_server_start`. In that case, `server->get_configuration().contains(my_id)` returned true and the node broke out of the join loop early, skipping `post_server_start`. `_join_node_group0_started` was therefore never set, so the node's `join_node_response` RPC handler blocked indefinitely. Meanwhile the topology coordinator's `respond_to_joining_node` call (which has no timeout) hung forever waiting for the reply that never came. Fix by only taking the early-break path when not starting as a follower (i.e. when the node is the discovery leader or is restarting). A joining node must always reach `post_server_start`. We also provide a regression test. It takes 6s in dev mode. Fixes SCYLLADB-959 Closes scylladb/scylladb#29266