Safe fallback from `ElementType` to `Type` in `update_or_create_hierarchy_from_dataframe`

[MariusWirtz]

There is a usability mismatch between:

• elements.get_elements_dataframe() defaulting element_type_column="Type"
• hierarchies.update_or_create_hierarchy_from_dataframe() defaulting element_type_column="ElementType"

Changing defaults now would break backward compatibility.
Could we add a safe fallback in update_or_create_hierarchy_from_dataframe:

1. Use ElementType if present.
2. If missing, use Type only when all non-null values match valid element type values.
3. If validation fails, treat Type as a regular attribute and raise a clear error that ElementType is required.

This avoids breaking existing scripts while preventing conflicts where Type is a genuine dimension attribute.