ClangFormat: Start to use new file management

- Indenter uses .clang-format file from a dir of
editing file or from a parent dir. If there is no
such file then indenter starts to use file from a dir
with the name current CodeStyle settings.
- Test fixed

ToDo: Add file absentness processing in case of import

Change-Id: If09ef0c598899856b948c214e524bcfd5dad76e2
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/clangformat/tests/clangformat-test.cpp

@@ -52,7 +52,7 @@ public:
     ClangFormatExtendedTestIndenter(QTextDocument *doc) : ClangFormatTestIndenter(doc) {}
 
 private:
-    bool formatWhileTyping() const override { return true; }
+    bool formatCodeInsteadOfIndent() const override { return true; }
 };
 
 ClangFormatTest::ClangFormatTest()