[clang-tidy] Remove enforcement of rule C.48 from cppcoreguidelines-prefer-member-init (#80330)

This functionality already exists in
cppcoreguidelines-use-default-member-init. It was deprecated from this
check in clang-tidy 17.

This allows us to fully decouple this check from the corresponding
modernize check, which has an unhealthy dependency.

Fixes https://github.com/llvm/llvm-project/issues/62169



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Co-authored-by: Carlos Gálvez <carlos.galvez@zenseact.com>