[libc++] Install clang-tools in the CI container

This is required for using clang-query in the CI

Reviewed By: Mordante, #libc

Spies: libcxx-commits, arichardson

Differential Revision: https://reviews.llvm.org/D130845

GitOrigin-RevId: 648d99e7dd21b0ac77637e99c9a3b9e52b53e9aa
1 file changed