Marking flaky test

common.test.acceptance.tests.video.test_video_module.YouTubeVideoTest.test_video_component_stores_speed_correctly_for_multiple_videos
is flaky, see for details.

common/test/acceptance/tests/video/test_video_module.py

@@ -588,6 +588,7 @@ class YouTubeVideoTest(VideoBaseTest):
         self.go_to_sequential_position(1)
         execute_video_steps(tab1_video_names)
 
+    @flaky  # TODO: fix this, ticket TNL-3725
     def test_video_component_stores_speed_correctly_for_multiple_videos(self):
         """
         Scenario: Video component stores speed correctly when each video is in separate sequential