catalog-model: deprecate ENTITY_DEFAULT_NAMESPACE, replace with DEFAULT_NAMESPACE

Signed-off-by: Johan Haals <johan.haals@gmail.com>

plugins/techdocs-backend/src/DocsBuilder/builder.ts

@@ -15,7 +15,7 @@
  */
 import {
   Entity,
-  ENTITY_DEFAULT_NAMESPACE,
+  DEFAULT_NAMESPACE,
   stringifyEntityRef,
 } from '@backstage/catalog-model';
 import { Config } from '@backstage/config';
@@ -111,8 +111,7 @@ export class DocsBuilder {
       try {
         storedEtag = (
           await this.publisher.fetchTechDocsMetadata({
-            namespace:
-              this.entity.metadata.namespace ?? ENTITY_DEFAULT_NAMESPACE,
+            namespace: this.entity.metadata.namespace ?? DEFAULT_NAMESPACE,
             kind: this.entity.kind,
             name: this.entity.metadata.name,
           })

plugins/techdocs-backend/src/service/DocsSynchronizer.ts

@@ -15,7 +15,7 @@
  */
 
 import { PluginEndpointDiscovery } from '@backstage/backend-common';
-import { Entity, ENTITY_DEFAULT_NAMESPACE } from '@backstage/catalog-model';
+import { Entity, DEFAULT_NAMESPACE } from '@backstage/catalog-model';
 import { Config } from '@backstage/config';
 import { assertError, NotFoundError } from '@backstage/errors';
 import { ScmIntegrationRegistry } from '@backstage/integration';
@@ -177,7 +177,7 @@ export class DocsSynchronizer {
 
     // Fetch techdocs_metadata.json from the publisher and from cache.
     const baseUrl = await discovery.getBaseUrl('techdocs');
-    const namespace = entity.metadata?.namespace || ENTITY_DEFAULT_NAMESPACE;
+    const namespace = entity.metadata?.namespace || DEFAULT_NAMESPACE;
     const kind = entity.kind;
     const name = entity.metadata.name;
     const legacyPathCasing =