Refactor geometry node groups for image depth processing

- Introduced new utility functions in common nodes for evaluating fields and capturing attributes.
- Simplified volume field calculations in image depth cutout and panorama groups by utilizing new utility functions.
- Enhanced readability and maintainability of the image depth cutout and panorama node groups by removing redundant code and improving function usage.
- Adjusted default values for thickness and depth scale in image relief plane group for better user experience.
- Improved handling of geometry attributes and connections in image depth plane group to streamline processing.

tests/tools/nodes/test_depth_surface_split.py

@@ -200,7 +200,7 @@ def test_stored_point_positions_prevent_depth_resampling_on_side_walls():
 
 @pytest.mark.parametrize("thickness", [0.0, 0.2])
 @pytest.mark.parametrize("split", [0.0, 0.5])
-def test_temporary_attributes_are_removed_and_user_attributes_survive(thickness, split):
+def test_internal_fields_stay_anonymous_and_user_attributes_survive(thickness, split):
     obj, set_value = surface(wrapper=True)
     obj.data.attributes.new("o_depth_probe", "FLOAT", "POINT")
     attribute = obj.data.attributes.new("o_user_weight", "FLOAT", "POINT")
@@ -212,7 +212,7 @@ def test_temporary_attributes_are_removed_and_user_attributes_survive(thickness,
     result = obj.evaluated_get(bpy.context.evaluated_depsgraph_get())
     mesh = result.to_mesh()
     try:
-        assert not any(a.name.startswith("o_depth_") for a in mesh.attributes)
+        assert {a.name for a in mesh.attributes if a.name.startswith(("o_depth_", "o_balloon_surface_"))} == {"o_depth_probe"}
         assert "UVMap" in mesh.attributes
         assert all(
             v.value == pytest.approx(0.75)