backend-plugin-api: Remove ServiceFactoryOrFunction type

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

.changeset/purple-cows-sing.md

@@ -0,0 +1,5 @@
+---
+'@backstage/backend-plugin-api': minor
+---
+
+Removed deprecated `ServiceFactoryOrFunction` type.

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

@@ -623,9 +623,6 @@ export interface ServiceFactory<
   service: ServiceRef<TService, TScope, TInstances>;
 }
 
-// @public @deprecated
-export type ServiceFactoryOrFunction = ServiceFactory | (() => ServiceFactory);
-
 // @public
 export type ServiceRef<
   TService,

packages/backend-plugin-api/src/services/system/index.ts

@@ -20,6 +20,5 @@ export type {
   ServiceFactory,
   PluginServiceFactoryOptions,
   RootServiceFactoryOptions,
-  ServiceFactoryOrFunction,
 } from './types';
 export { createServiceRef, createServiceFactory } from './types';

packages/backend-plugin-api/src/services/system/types.ts

@@ -76,14 +76,6 @@ export interface InternalServiceFactory<
   ): Promise<TService>;
 }
 
-/**
- * Represents either a {@link ServiceFactory} or a function that returns one.
- *
- * @deprecated The support for service factory functions is deprecated and will be removed.
- * @public
- */
-export type ServiceFactoryOrFunction = ServiceFactory | (() => ServiceFactory);
-
 /** @public */
 export interface ServiceRefOptions<
   TService,