AutoTest: Use TestResult as value type

Don't construct it on heap and don't use shared pointer for it.

Change-Id: I51c9da405ed14d24b5f20242b4d049f9e2958f09
Reviewed-by: Christian Stenger <christian.stenger@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

src/plugins/autotest/qtest/qttestframework.cpp

@@ -18,10 +18,7 @@ ITestParser *QtTestFramework::createTestParser()
 
 ITestTreeItem *QtTestFramework::createRootNode()
 {
-    return new QtTestTreeItem(
-                this,
-                displayName(),
-                Utils::FilePath(), ITestTreeItem::Root);
+    return new QtTestTreeItem(this, displayName(), {}, ITestTreeItem::Root);
 }
 
 const char *QtTestFramework::name() const