{fmt} v10.0.0 introduces formatter for `std::optional`, so there
is no need to test it. furthermore the behavior of this formatter
is different from our homebrew one. so let's skip this test if
{fmt} v10.0.0 or up is used.
Refs #18508
Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
Closes scylladb/scylladb#18509
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