Fix(databricks): Materialized view drop failure due to incorrect type

[themisvaltinos]

This fixes #5249 and correctly maps MATERIALIZED_VIEW to materialized_view instead of view in the case statement of _get_data_objects.

Previously the Databricks adapter was incorrectly identifying materialized views as regular views. This caused DROP VIEW to be issued instead of DROP MATERIALIZED VIEW resulting in the error:

Cannot drop a materialized view with DROP VIEW. Please use DROP MATERIALIZED VIEW instead

---

failure scenatio

So this wasn't exercised before #5087 but now since drop_data_object_on_type_mismatch is called like this inside create_view:

self.drop_data_object_on_type_mismatch(
      self.get_data_object(view_name),
      DataObjectType.VIEW if not materialized else DataObjectType.MATERIALIZED_VIEW,
)

• get_data_object internally would return a materialised view's type as view while the conditional would correctly map as materialised view
• this incorrect mismatch would result in the drop_data_object operation inside drop_data_object_on_type_mismatch
• the drop would use the type returned from the query which would be view thus resulting in the error