Revert "ClangCodeModel: Rename via LSP facilities"

We cannot use clangd's rename facilities yet, as there is a
hardcoded limit of affected files.
This mostly reverts commit 7dc2c6b3b3.

Change-Id: Ie441796569b533948cc028c867175d6f9d4b9d54
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/clangcodemodel/clangdfindreferences.h

@@ -25,7 +25,7 @@ class ClangdFindReferences : public QObject
 public:
     explicit ClangdFindReferences(ClangdClient *client, TextEditor::TextDocument *document,
                                   const QTextCursor &cursor, const QString &searchTerm,
-                                  bool categorize);
+                                  const std::optional<QString> &replacement, bool categorize);
     ~ClangdFindReferences();
 
 signals: