Tracing: Restore support for Qt >= 6.2

First (try to) add the "Tracing" target as Qt Creator library, *then*
check whether it exists.

amends: f29d7b896f

Change-Id: I931e3ff632324faf4c6e07e8e083f00c55df197f
Reviewed-by: hjk <hjk@qt.io>

src/libs/tracing/CMakeLists.txt

@@ -43,10 +43,6 @@ if(${Qt5_VERSION} VERSION_LESS "6.2.0")
       qml/tracing.qrc
   )
 else() # < Qt 6.2
-  if (NOT TARGET Tracing)
-    return()
-  endif()
-
   add_qtc_library(Tracing
     FEATURE_INFO
     DEPENDS Utils Qt5::Qml Qt5::Quick
@@ -55,6 +51,10 @@ else() # < Qt 6.2
       ${TEST_SOURCES}
   )
 
+  if (NOT TARGET Tracing)
+    return()
+  endif()
+
   set(TRACING_QML_FILES
     qml/ButtonsBar.qml
     qml/CategoryLabel.qml