CppEditor: Make renameIncludes() also work for moved files

Task-number: QTCREATORBUG-26545
Change-Id: I0bfe203af8f091562cdd91411dbe502fc5a76956
Reviewed-by: David Schulz <david.schulz@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

tests/cppmodelmanager/testdata_renameheaders/main.cpp

@@ -0,0 +1,5 @@
+#include "header.h"
+#include "subdir1/header1.h"
+#include <header2.h>
+
+int main() {}