[clang-tools-extra] Follow style configuration in clangd when inserting missing includes (PR #140594)

[Nathan Ridge via cfe-commits]

HighCommander4 wrote:

Given that we haven't heard objections, I think we should proceed with using resolved paths in `IncludeInserter` as well. It would probably be best to do that before the clangd 21 release, so that we don't ship a release where two different features are interpreting the config keys in different ways.

@Harald-R, are you interested in writing a patch to use resolved paths in `IncludeInserter`? I'm happy to provide more detailed code pointers if you'd like.

https://github.com/llvm/llvm-project/pull/140594