General: Exclude Storybook's PageValildator to separate target in Makefile to mitigate QTBUG-92236

This workaround can be removed after full migration to Qt >= 5.15.4

Makefile

@@ -360,7 +360,12 @@ run-storybook: storybook-build
 
 run-storybook-tests: storybook-build
 	echo -e "\033[92mRunning:\033[39m Storybook Tests"
-	ctest -V --test-dir $(STORYBOOK_BUILD_PATH)
+	ctest -V --test-dir $(STORYBOOK_BUILD_PATH) -E PagesValidator
+
+# repeat because of https://bugreports.qt.io/browse/QTBUG-92236 (Qt < 5.15.4)
+run-storybook-pages-validator: storybook-build
+	echo -e "\033[92mRunning:\033[39m Storybook Pages Validator"
+	ctest -V --test-dir $(STORYBOOK_BUILD_PATH) -R PagesValidator --repeat until-pass:3
 
 storybook-clean:
 	echo -e "\033[92mCleaning:\033[39m Storybook"

ci/Jenkinsfile.tests-ui

@@ -103,6 +103,20 @@ pipeline {
       } }
     }
 
+    stage('Check Storybook Pages Validator') {
+      steps { script {
+        /* Needed for QGuiApplication to import QtQuick.Dialogs */
+        wrap([
+          $class: 'Xvfb',
+          autoDisplayName: true,
+          parallelBuild: true,
+          screen: '2560x1440x24',
+        ]) {
+          sh('make run-storybook-pages-validator')
+        }
+      } }
+    }
+
     stage('Upload') {
       steps { script {
         env.PKG_URL = "${currentBuild.absoluteUrl}/consoleText"