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

[kadir çetinkaya via cfe-commits]

https://github.com/kadircet approved this pull request.

thanks, mostly LGTM, please wait on a final look from @HighCommander4 though, he has more context about this feature overall, maybe the discrepancy on path vs spelling based match has a story.

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