[clang] [clang-tools-extra] [clangd] Make clangd run `format::cleanupAroundReplacements()` for all code actions just as clang-tidy does (PR #118569)

[Chris B via cfe-commits]

================
@@ -342,6 +342,20 @@ llvm::Error Replacements::add(const Replacement &R) {
   return llvm::Error::success();
 }
 
+llvm::Error Replacements::addOrMerge(const Replacement &R) {
+  auto Err = add(R);
+  if (Err) {
----------------
llvm-beanz wrote:

nit: You could rewrite this as:
```suggestion
  if (llvm::Error Err = add(R)) {
```

https://github.com/llvm/llvm-project/pull/118569