[dsymutil][llvm-dwarfutil] Rename command line options to avoid using vendor names. (#78135)

This patch renames values of dsymutil/llvm-dwarfutil options:

--linker apple -> --linker classic
--linker llvm -> --linker parallel

The purpose to rename options is to avoid using vendor names and to
match with library names. It should be safe to rename options at current
stage as they are not seemed widely used(we may not preserve backward
compatibility).