[llvm-branch-commits] [clang-tools-extra] [clang] [llvm] [Clangd] Refactor Check to have more explicit cli args. (PR #75867)

[Andres Villegas via llvm-branch-commits]

https://github.com/avillega created https://github.com/llvm/llvm-project/pull/75867

Move the definition of the Check* command line options into the
ClangdMain file, to make them more explicit.

This is in preparation of moving Clangd to use OptTable to parse
its commnad line options.