[clang-tools-extra] [clangd] forward clang-tidy's readability-identifier-naming fix to textDocument/rename (PR #78454)

[Nathan Ridge via cfe-commits]

HighCommander4 wrote:

(It's also no longer labelled as a "quick fix", likely due to the `CodeActionKind` changing from `quickfix` to `refactor`, but that's probably fine.)

https://github.com/llvm/llvm-project/pull/78454