[clang-format] Defer formatting of operator< to honor paren spacing

I'm not exactly sure what the intent of that section of
`spaceRequiredBetween` is doing, it seems to handle templates and <<,
but the part which adds spaces before parens is way later, as part
of `spaceRequiredBeforeParens`.

Fixes https://github.com/llvm/llvm-project/issues/58821

Reviewed By: HazardyKnusperkeks, owenpan, MyDeveloperDay

Differential Revision: https://reviews.llvm.org/D137474