After changing `left_token_ring` from a node state to a transition
state in scylladb/scylladb#17009, we do the same for
`rollback_to_normal`. `rollback_to_normal` was created as a node
state because `left_token_ring` was a node state.
This change will allow us to distinguish a failed removenode from
a failed decommission in the `rollback_to_normal` handler.
Currently, we use the same logic for both of them, so it's not
required. However, this might change, as it has happened with the
decommission and the failed bootstrap/replace in the
`left_token_ring` state (scylladb/scylladb#16797). We are making
this change now because it would be much harder after branching.
Fixesscylladb/scylladb#17032Closesscylladb/scylladb#17136
* github.com:scylladb/scylladb:
docs: dev: topology-over-raft: align indentation
docs: dev: topology-over-raft: document the rollback_to_normal state
topology_coordinator: improve logs in rollback_to_normal handler
raft topology: make rollback_to_normal a transition state
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