[clang] [clang-tools-extra] [llvm] Remove clang-rename (PR #108988)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

> Also these bazel build scripts
> 
> ```
> llvm/utils/gn/secondary/clang-tools-extra/test/BUILD.gn:    "//clang/tools/clang-rename",
> llvm/utils/gn/secondary/clang/test/BUILD.gn:    "//clang/tools/clang-rename",
> llvm/utils/gn/secondary/clang/tools/clang-rename/BUILD.gn:executable("clang-rename") {
> utils/bazel/llvm-project-overlay/clang/BUILD.bazel:    "tools/clang-rename/clang-rename.el",
> utils/bazel/llvm-project-overlay/clang/BUILD.bazel:    name = "clang-rename",
> utils/bazel/llvm-project-overlay/clang/BUILD.bazel:    srcs = glob(["tools/clang-rename/*.cpp"]),
> ```

I took a shot at those; I think `gn` and `Bazel` are traditionally outside the scope of what community supports though, so I don't know if I've done this right or not.

https://github.com/llvm/llvm-project/pull/108988