[clang-tidy][NFC] Enable misc-const-correctness rule in clang-tidy codebase (#167172)
After successful `misc-const-correctness` cleanup (last patch
https://github.com/llvm/llvm-project/pull/167131), we can enable
`misc-const-correctness` rule for the whole project.
During cleanup, I didn't encounter any false positives so it's safe to
assume that we will have minimal FP in the future.