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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, `fmt::formatter<cdc::no_generation_data_exception>` is
added for backward compatibility with {fmt} < 10.
Refs #13245
Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>