ITS: use vendor_api_level to gate new test on existing features

files affected:
  utils/its_session_utils.py
  tests/scene2_a/test_auto_flash.py
  tests/scene4/test_video_aspect_ratio_and_crop.py
  tests/sensor_fusion/test_video_stabilization.py

other changes:
  match method name to test name in test_video_stabilization.py

bug: 239156677
Change-Id: If95056c769de2047d09786d45fbf8d1ae609d829
4 files changed