Move file of test helpers out of directory for qtconcurrentmap tests

The test helpers are used both in the qtconcurrentmap tests and in the
qtconcurrentfilter tests. In the future, they should also be used
in generated tests. This patch moves the function out of the
qtconcurrentmap folder as it is not specific to 'map'.

Change-Id: Ie79a7ae3040a7eab7364a3aabf934158c7527b5a
Reviewed-by: Sona Kurazyan <sona.kurazyan@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

tests/auto/concurrent/qtconcurrentfilter/tst_qtconcurrentfilter.cpp

@@ -30,7 +30,7 @@
 #include <QList>
 #include <QtTest/QtTest>
 
-#include "../qtconcurrentmap/functions.h"
+#include "../testhelper_functions.h"
 
 class tst_QtConcurrentFilter : public QObject
 {

tests/auto/concurrent/qtconcurrentmap/tst_qtconcurrentmap.cpp

@@ -34,7 +34,7 @@
 
 #include <QtTest/QtTest>
 
-#include "functions.h"
+#include "../testhelper_functions.h"
 
 class tst_QtConcurrentMap : public QObject
 {