Merge pull request #30296 from backstage/blam/changeset-cleanup

`{backend-plugin-api,backend-defaults,backend-test-utils}`: changeset cleanup

.changeset/sweet-ducks-wait.md

@@ -2,4 +2,29 @@
 '@backstage/backend-test-utils': minor
 ---
 
-Added mock implementations for `ActionsService` and `ActionsRegistryService`
+Added an `actionsRegistryServiceMock` and `actionsServiceMock` to `/alpha` export for the experimental services.
+
+This allows you to write tests for your actions by doing something similar to the following:
+
+```ts
+import { actionsRegistryServiceMock } from '@backstage/backend-test-utils/alpha';
+
+const mockActionsRegistry = actionsRegistryServiceMock();
+const mockCatalog = catalogServiceMock({
+  entities: [
+   ...
+  ],
+});
+
+createGetCatalogEntityAction({
+  catalog: mockCatalog,
+  actionsRegistry: mockActionsRegistry,
+});
+
+await expect(
+  mockActionsRegistry.invoke({
+    id: 'test:get-catalog-entity',
+    input: { name: 'test' },
+  }),
+).resolves.toEqual(...)
+```

.changeset/wet-bars-report.md

@@ -2,4 +2,30 @@
 '@backstage/backend-plugin-api': minor
 ---
 
-Added `coreServices.actionsRegistry` and `coreServices.actions` to allow registration of distributed actions from plugins, and the ability to invoke these actions
+Added `actionsRegistry` and `actions` experimental services to `/alpha` to allow registration of distributed actions from plugins, and the ability to invoke these actions. You can use these services by including them like the following:
+
+```ts
+import {
+  actionsRegistryServiceRef,
+  actionsServiceRef,
+} from '@backstage/backend-plugin-api/alpha';
+
+createBackendPlugin({
+  pluginId: 'test-plugin',
+  register({ registerInit }) {
+    registerInit({
+      deps: {
+        actions: actionsServiceRef,
+        actionsRegistry: actionsRegistryServiceRef,
+      },
+      async init({ actions, actionsRegistry }) {
+        actionsRegistry.register({
+          ...,
+        });
+
+        await actions.invoke(...);
+      },
+    });
+  },
+});
+```

.changeset/wet-bars-reporting.md

@@ -2,4 +2,4 @@
 '@backstage/backend-defaults': patch
 ---
 
-Added some default implementations for the `ActionsService` and `ActionsRegistryService` that allow registration of actions for a particular plugin.
+Added some default implementations for the experimental `ActionsService` and `ActionsRegistryService` under `/alpha` that allow registration of actions for a particular plugin.