[clang] [clang-format] Skip PP directives when determining brace kind (PR #69473)

[Emilia Kond via cfe-commits]

rymiel wrote:

I didn't expect you to not want to be credited, but I'll respect your opinion! GitHub adds co-ownership automatically if using the web ui to commit a suggestion (which is what happened in that other PR you pinged me in), but in this case I did add it manually :)

https://github.com/llvm/llvm-project/pull/69473