Implement LWG-4013 lazy_split_view::outer-iterator::value_type
should not provide default constructor
#4530
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Fixes #4503.
Skips two libcxx tests:
std/ranges/range.adaptors/range.lazy.split/range.lazy.split.outer.value/ctor.default.pass.cpp
std/ranges/range.adaptors/range.lazy.split/range.lazy.split.outer.value/ctor.iter.pass.cpp