packages,plugins: migrate to using TestApiProvider and Registry

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

plugins/github-deployments/src/components/GithubDeploymentsCard.test.tsx

@@ -19,6 +19,7 @@ import { fireEvent } from '@testing-library/react';
 import {
   setupRequestMockHandlers,
   renderInTestApp,
+  TestApiRegistry,
 } from '@backstage/test-utils';
 import {
   GithubDeployment,
@@ -42,11 +43,7 @@ import { Entity } from '@backstage/catalog-model';
 import { GithubDeploymentsTable } from './GithubDeploymentsTable';
 import { Box } from '@material-ui/core';
 
-import {
-  ApiProvider,
-  ApiRegistry,
-  ConfigReader,
-} from '@backstage/core-app-api';
+import { ApiProvider, ConfigReader } from '@backstage/core-app-api';
 import {
   errorApiRef,
   configApiRef,
@@ -95,14 +92,14 @@ const githubAuthApi: OAuthApi = {
   getAccessToken: async _ => 'access_token',
 };
 
-const apis = ApiRegistry.from([
+const apis = TestApiRegistry.from(
   [configApiRef, configApi],
   [errorApiRef, errorApiMock],
   [
     githubDeploymentsApiRef,
     new GithubDeploymentsApiClient({ scmIntegrationsApi, githubAuthApi }),
   ],
-]);
+);
 
 const assertFetchedData = async () => {
   const rendered = await renderInTestApp(