[clang-tidy][readability-identifier-naming] Resolve symlinks for checking style for file (#81985)

Summary:
Some build systems create symlinks in a temporary build directory for
headers in the source tree for isolation purposes. These symlinks
prevent `readability-identifier-naming` detecting issues and applying
fixes. Without this fix clang-tidy is checking .clang-tidy config file
in a temporary directory instead of source source location.

Test Plan: check-clang-tools