NFC: Make clang resource headers an interface library (#88317)

Making the clang resource headers into an interface library instead of a
custom target means that we can attach the header search paths to the
library. Targets that "link" against this library will automatically
have the appropriate paths added to their header search paths to find
them. Then downstream projects that embed a copy of clang can query the
generated `ClangTargets.cmake` file for the header location instead of
attempting to compute them.