[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]

================
@@ -761,7 +762,37 @@ void StoreDiags::HandleDiagnostic(DiagnosticsEngine::Level DiagLevel,
         return false;
       if (!isInsideMainFile(FixIt.RemoveRange.getBegin(), SM))
         return false;
-      Edits.push_back(toTextEdit(FixIt, SM, *LangOpts));
+
+      auto R = tooling::Replacement(SM, FixIt.RemoveRange, FixIt.CodeToInsert,
+                                    *LangOpts);
+      auto Err = Replacements->addOrMerge(R);
+      if (Err) {
+        log("Skipping formatting the replacement due to conflict: {0}",
+            llvm::toString(std::move(Err)));
+        Replacements = std::nullopt;
+        break;
+      }
+    }
+
+    llvm::SmallVector<TextEdit, 1> Edits;
+
+    if (Replacements) {
+      StringRef Code = SM.getBufferData(SM.getMainFileID());
+      auto Repl = format::cleanupAroundReplacements(Code, *Replacements,
+                                                    format::getNoStyle());
----------------
llvm-beanz wrote:

nit:
```suggestion
      Expected<Replacements> Repl = format::cleanupAroundReplacements(
          Code, *Replacements, format::getNoStyle());
```
LLVM's style guide discourages auto when the type isn't clear from context.
see: https://llvm.org/docs/CodingStandards.html#use-auto-type-deduction-to-make-code-more-readable

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