[clang-tools-extra] Revert "[clangd] Add feature modules registry" (PR #154711)

[kadir çetinkaya via cfe-commits]

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

thanks, for the future, feel free to land reverts (espeically of your own commits) without review

https://github.com/llvm/llvm-project/pull/154711