remove experimental service from core services

Signed-off-by: aramissennyeydd <aramis.sennyey@doordash.com>

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

@@ -34,3 +34,6 @@ export const featureDiscoveryServiceRef =
     id: 'core.featureDiscovery',
     scope: 'root',
   });
+
+export { experimentalServices } from './services/definitions/experimentalServices';
+export type { BackendFeatureMeta } from './services/definitions/InstanceMetadataService';

packages/backend-plugin-api/src/services/definitions/coreServices.ts

@@ -251,15 +251,4 @@ export namespace coreServices {
   export const urlReader = createServiceRef<
     import('./UrlReaderService').UrlReaderService
   >({ id: 'core.urlReader' });
-
-  /**
-   * EXPERIMENTAL: Instance metadata service.
-   *
-   * @public
-   */
-  export const EXPERIMENTAL_instanceMetadata = createServiceRef<
-    import('./InstanceMetadataService').InstanceMetadataService
-  >({
-    id: 'core.instanceMetadata',
-  });
 }

packages/backend-plugin-api/src/services/definitions/experimentalServices.ts

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2024 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 { createServiceRef } from '../system';
+
+export namespace experimentalServices {
+  /**
+   * EXPERIMENTAL: Instance metadata service.
+   *
+   * @public
+   */
+  export const EXPERIMENTAL_instanceMetadata = createServiceRef<
+    import('./InstanceMetadataService').InstanceMetadataService
+  >({
+    id: 'core.instanceMetadata',
+  });
+}