[libc++][test] Move the SFINAE test for return types of quoted
to libcxx/test/libcxx/
#157026
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[quoted.manip] only specifies that
operator<<
/operator>>
is well-formed for operands with suitable types, and leaves it undefined whether they are SFINAE-friendly.Although it's worthwhile making them SFINAE-friendly, perhaps the SFINAE-friendliness should be considered as a libc++-specific choice at this moment.
Also clang-format the file to make CI happy.