Tests: update GPU volume tests

New files are added since 5646d9a5ca

Pull Request: https://projects.blender.org/blender/blender/pulls/144622

tests/python/storm_render_tests.py

@@ -15,6 +15,8 @@ BLOCKLIST_HYDRA = [
     "image.*_float.*.blend",
     # Differences between devices/drivers causing this to fail
     "image.blend",
+    # VDB rendering is incorrect on Metal
+    "overlapping_octrees.blend",
 ]
 
 BLOCKLIST_USD = [
@@ -23,6 +25,8 @@ BLOCKLIST_USD = [
     "image.*_float.*.blend",
     # Nondeterministic exporting of lights in the scene
     "light_tree_node_subtended_angle.blend",
+    # VDB rendering is incorrect on Metal
+    "overlapping_octrees.blend",
 ]
 
 # Metal support in Storm is no as good as OpenGL, though this needs to be