[clang-tools-extra] [llvm] [clang-tidy] Prototype: removing the `IncludeStyle` option (PR #185879)

[Carlos Galvez via cfe-commits]

carlosgalvezp wrote:

I'm all up for this! Note that since this is a breaking change, first we need to document the option as deprecated and do the actual removal (this patch) after 2 releases.

https://github.com/llvm/llvm-project/pull/185879