backend-test-utils: mark backend system utils as stable

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

.changeset/silent-roses-join.md

@@ -0,0 +1,5 @@
+---
+'@backstage/backend-test-utils': patch
+---
+
+The new backend system testing utilities have now been marked as stable API.

packages/backend-test-utils/api-report.md

@@ -28,7 +28,7 @@ import { UrlReaderService } from '@backstage/backend-plugin-api';
 // @public (undocumented)
 export function isDockerDisabledForTests(): boolean;
 
-// @alpha (undocumented)
+// @public (undocumented)
 export namespace mockServices {
   // (undocumented)
   export namespace cache {
@@ -126,7 +126,7 @@ export function setupRequestMockHandlers(worker: {
   resetHandlers: () => void;
 }): void;
 
-// @alpha (undocumented)
+// @public (undocumented)
 export function startTestBackend<
   TServices extends any[],
   TExtensionPoints extends any[],
@@ -134,12 +134,12 @@ export function startTestBackend<
   options: TestBackendOptions<TServices, TExtensionPoints>,
 ): Promise<TestBackend>;
 
-// @alpha (undocumented)
+// @public (undocumented)
 export interface TestBackend extends Backend {
   readonly server: ExtendedHttpServer;
 }
 
-// @alpha (undocumented)
+// @public (undocumented)
 export interface TestBackendOptions<
   TServices extends any[],
   TExtensionPoints extends any[],

packages/backend-test-utils/src/next/services/mockServices.ts

@@ -58,7 +58,7 @@ function simpleFactory<
 }
 
 /**
- * @alpha
+ * @public
  */
 export namespace mockServices {
   export function config(options?: config.Options): ConfigService {

packages/backend-test-utils/src/next/wiring/TestBackend.ts

@@ -36,7 +36,7 @@ import { mockServices } from '../services';
 import { ConfigReader } from '@backstage/config';
 import express from 'express';
 
-/** @alpha */
+/** @public */
 export interface TestBackendOptions<
   TServices extends any[],
   TExtensionPoints extends any[],
@@ -60,7 +60,7 @@ export interface TestBackendOptions<
   features?: BackendFeature[];
 }
 
-/** @alpha */
+/** @public */
 export interface TestBackend extends Backend {
   /**
    * Provides access to the underling HTTP server for use with utilities
@@ -89,7 +89,7 @@ const defaultServiceFactories = [
 
 const backendInstancesToCleanUp = new Array<Backend>();
 
-/** @alpha */
+/** @public */
 export async function startTestBackend<
   TServices extends any[],
   TExtensionPoints extends any[],