Replace deprecated humanizeEntityRef with Catalog Presentation API

Migrate all humanizeEntityRef and humanizeEntity usages to the Catalog
Presentation API across catalog, catalog-react, org-react,
catalog-import, scaffolder, and techdocs plugins.

- Use useEntityPresentation hook in React component contexts
  (AncestryPage)
- Use defaultEntityPresentation for non-React contexts like sort
  comparators, filter functions, and data mappers
- Add @deprecated tags to humanizeEntityRef and humanizeEntity
- Improve TSDoc on entityPresentationApiRef, EntityPresentationApi,
  useEntityPresentation, EntityDisplayName, and
  defaultEntityPresentation with guidance on which to use when
- Add Entity Presentation docs page with usage examples and migration
  guide

Made-with: Cursor

Signed-off-by: Marat Dyatko <maratd@spotify.com>

plugins/techdocs/src/home/components/Tables/helpers.ts

@@ -16,8 +16,8 @@
 
 import { RELATION_OWNED_BY, Entity } from '@backstage/catalog-model';
 import {
+  defaultEntityPresentation,
   getEntityRelations,
-  humanizeEntityRef,
 } from '@backstage/plugin-catalog-react';
 import { toLowerMaybe } from '../../../helpers';
 import { ConfigApi, RouteFunc } from '@backstage/core-plugin-api';
@@ -48,7 +48,11 @@ export function entitiesToDocsMapper(
         }),
         ownedByRelations,
         ownedByRelationsTitle: ownedByRelations
-          .map(r => humanizeEntityRef(r, { defaultKind: 'group' }))
+          .map(
+            r =>
+              defaultEntityPresentation(r, { defaultKind: 'group' })
+                .primaryTitle,
+          )
           .join(', '),
       },
     };