Fix alpha entry point translation ref re-exports to use @alpha instead of @public

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor

plugins/kubernetes-cluster/report-alpha.api.md

@@ -5,7 +5,7 @@
 ```ts
 import { TranslationRef } from '@backstage/frontend-plugin-api';
 
-// @public @deprecated (undocumented)
+// @alpha @deprecated (undocumented)
 export const kubernetesClusterTranslationRef: TranslationRef<
   'kubernetes-cluster',
   {

plugins/kubernetes-cluster/src/alpha.ts

@@ -17,7 +17,7 @@
 import { kubernetesClusterTranslationRef as _kubernetesClusterTranslationRef } from './translation';
 
 /**
- * @public
+ * @alpha
  * @deprecated Import from `@backstage/plugin-kubernetes-cluster` instead.
  */
 export const kubernetesClusterTranslationRef = _kubernetesClusterTranslationRef;