backend-plugin-api: removed the deprecated featureDiscoveryServiceRef

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

packages/backend-plugin-api/report-alpha.api.md

@@ -3,7 +3,6 @@
 > Do not edit this file. It is a report generated by [API Extractor](https://api-extractor.com/).
 
 ```ts
-import { BackendFeature } from '@backstage/backend-plugin-api';
 import { ServiceRef } from '@backstage/backend-plugin-api';
 
 // @alpha (undocumented)
@@ -18,21 +17,6 @@ export type BackendFeatureMeta =
       moduleId: string;
     };
 
-// @alpha (undocumented)
-export interface FeatureDiscoveryService {
-  // (undocumented)
-  getBackendFeatures(): Promise<{
-    features: Array<BackendFeature>;
-  }>;
-}
-
-// @alpha @deprecated
-export const featureDiscoveryServiceRef: ServiceRef<
-  FeatureDiscoveryService,
-  'root',
-  'singleton'
->;
-
 // @alpha (undocumented)
 export interface InstanceMetadataService {
   // (undocumented)

packages/backend-plugin-api/src/alpha.ts

@@ -14,26 +14,7 @@
  * limitations under the License.
  */
 
-import {
-  BackendFeature,
-  createServiceRef,
-} from '@backstage/backend-plugin-api';
-
-/** @alpha */
-export interface FeatureDiscoveryService {
-  getBackendFeatures(): Promise<{ features: Array<BackendFeature> }>;
-}
-
-/**
- * An optional service that can be used to dynamically load in additional BackendFeatures at runtime.
- * @alpha
- * @deprecated The `featureDiscoveryServiceRef` is deprecated in favor of using {@link @backstage/backend-defaults#discoveryFeatureLoader} instead.
- */
-export const featureDiscoveryServiceRef =
-  createServiceRef<FeatureDiscoveryService>({
-    id: 'core.featureDiscovery',
-    scope: 'root',
-  });
+import { createServiceRef } from '@backstage/backend-plugin-api';
 
 /**
  * EXPERIMENTAL: Instance metadata service.