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before this change, we rely on the default-generated fmt::formatter created from operator<<, but fmt v10 dropped the default-generated formatter. in this change, we define a formatter for gms::endpoint_state, and change update the callers of `operator<<` to use `fmt::print()`. but we cannot drop `operator<<` yet, as we are still using the templated operator<< and templated fmt::formatter to print containers in scylla and in seastar -- they are still using `operator<<` under the hood. Refs #13245 Signed-off-by: Kefu Chai <kefu.chai@scylladb.com> Closes scylladb/scylladb#16705