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5fb8da4181
In this commit we just pass a fencing_token through hint_mutation RPC verb. The hints manager uses either storage_proxy::send_hint_to_all_replicas or storage_proxy::send_hint_to_endpoint to send a hint. Both methods capture the current erm and use the corresponding fencing token from it in the mutation or hint_mutation RPC verb. If these verbs are fenced out, the server stale_topology_exception is translated to a mutation_write_failure_exception on the client with an appropriate error message. The hint manager will attempt to resend the failed hint from the commitlog segment after a delay. However, if delivery is unsuccessful, the hint will be discarded after gc_grace_seconds. Closes #14580