apply core-imports codemod to all packages and plugins

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

plugins/welcome/src/components/WelcomePage/WelcomePage.test.tsx

@@ -14,19 +14,19 @@
  * limitations under the License.
  */
 
-import {
-  ApiProvider,
-  ApiRegistry,
-  configApiRef,
-  ConfigReader,
-  errorApiRef,
-} from '@backstage/core';
 import { renderInTestApp } from '@backstage/test-utils';
 import { lightTheme } from '@backstage/theme';
 import { ThemeProvider } from '@material-ui/core';
 import React from 'react';
 import WelcomePage from './WelcomePage';
 
+import {
+  ApiProvider,
+  ApiRegistry,
+  ConfigReader,
+} from '@backstage/core-app-api';
+import { configApiRef, errorApiRef } from '@backstage/core-plugin-api';
+
 describe('WelcomePage', () => {
   it('should render', async () => {
     const { baseElement } = await renderInTestApp(

plugins/welcome/src/components/WelcomePage/WelcomePage.tsx

@@ -24,6 +24,7 @@ import {
   ListItemText,
   Link,
 } from '@material-ui/core';
+
 import {
   Content,
   InfoCard,
@@ -33,9 +34,9 @@ import {
   ContentHeader,
   SupportButton,
   WarningPanel,
-  useApi,
-  configApiRef,
-} from '@backstage/core';
+} from '@backstage/core-components';
+
+import { useApi, configApiRef } from '@backstage/core-plugin-api';
 
 const WelcomePage = () => {
   const appTitle =

plugins/welcome/src/plugin.ts

@@ -18,7 +18,7 @@ import {
   createPlugin,
   createRoutableExtension,
   createRouteRef,
-} from '@backstage/core';
+} from '@backstage/core-plugin-api';
 
 export const rootRouteRef = createRouteRef({
   title: 'Welcome',