Move qpa examples to manual tests

Change-Id: I7b25b1c8100f04eec3d9a571f59a1babef55b1d5
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
(cherry picked from commit 6c96218b43667ae47364f303b566be6e0e5779fa)
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

examples/CMakeLists.txt

@@ -5,7 +5,6 @@ qt_examples_build_begin(EXTERNAL_BUILD)
 
 add_subdirectory(corelib)
 add_subdirectory(embedded)
-add_subdirectory(qpa)
 if(TARGET Qt6::DBus)
     add_subdirectory(dbus)
 endif()

examples/examples.pro

@@ -3,8 +3,7 @@ CONFIG += no_docs_target
 
 SUBDIRS = \
     corelib \
-    embedded \
-    qpa
+    embedded
 
 !contains(TEMPLATE, "vc.*") {    # QTBUG-91033
     qtHaveModule(dbus): SUBDIRS += dbus