Support Custom Subcategories in Cognite Search

In our use case, we modeled several related data categories, but they all appear as a flat list in Cognite Search, mixed with unrelated categories.

From a usability perspective, it would be valuable to organize these related views under a custom parent category, with an expandable dropdown, similar to the existing grouping available for CogniteCore views.

This would make navigation more intuitive and reduce category clutter, especially for Data Models containing multiple related entities.

The request is to extend the existing category grouping functionality to custom Data Models, without requiring their views to inherit from CogniteCore views.