Update to use coreExtensionsData.title

Signed-off-by: Adam Kunicki <kunickiaj@gmail.com>

plugins/home-react/report-alpha.api.md

@@ -83,13 +83,6 @@ export const homeReactTranslationRef: TranslationRef<
   }
 >;
 
-// @alpha
-export const titleExtensionDataRef: ConfigurableExtensionDataRef<
-  string,
-  'title',
-  {}
->;
-
 // @alpha
 export const widgetMetadataRef: ConfigurableExtensionDataRef<
   {

plugins/home-react/src/alpha.ts

@@ -24,7 +24,6 @@
  * @packageDocumentation
  */
 export { homeReactTranslationRef } from './translation';
-export { titleExtensionDataRef } from './alpha/dataRefs';
 export {
   HomepageWidgetBlueprint,
   widgetMetadataRef,

plugins/home-react/src/alpha/dataRefs.ts

@@ -1,26 +0,0 @@
-/*
- * Copyright 2025 The Backstage Authors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-import { createExtensionDataRef } from '@backstage/frontend-plugin-api';
-
-/**
- * Title data supplied to the home page extension when composing via the new frontend system.
- *
- * @alpha
- */
-export const titleExtensionDataRef = createExtensionDataRef<string>().with({
-  id: 'title',
-});