feat(core): add support config & button/error components

This adds a new app.support top level config that can be used to
configure various support links and other information. This can later be
extended for plugins to append their own specific support items.

plugins/tech-radar/src/components/RadarPage.test.tsx

@@ -14,16 +14,19 @@
  * limitations under the License.
  */
 
-import React from 'react';
-import { render, waitForElement } from '@testing-library/react';
-import { ThemeProvider } from '@material-ui/core';
+import { ApiProvider, ApiRegistry, errorApiRef } from '@backstage/core';
+import {
+  MockErrorApi,
+  renderInTestApp,
+  wrapInTestApp,
+} from '@backstage/test-utils';
 import { lightTheme } from '@backstage/theme';
-import { ApiRegistry, ApiProvider, errorApiRef } from '@backstage/core';
-
+import { ThemeProvider } from '@material-ui/core';
+import { render, waitForElement } from '@testing-library/react';
+import React from 'react';
+import { act } from 'react-dom/test-utils';
 import GetBBoxPolyfill from '../utils/polyfills/getBBox';
 import { RadarPage } from './RadarPage';
-import { act } from 'react-dom/test-utils';
-import { MockErrorApi, wrapInTestApp } from '@backstage/test-utils';
 
 describe('RadarPage', () => {
   beforeAll(() => {
@@ -67,12 +70,10 @@ describe('RadarPage', () => {
       svgProps: { 'data-testid': 'tech-radar-svg' },
     };
 
-    const { getByText, getByTestId } = render(
-      wrapInTestApp(
-        <ThemeProvider theme={lightTheme}>
-          <RadarPage {...techRadarProps} />
-        </ThemeProvider>,
-      ),
+    const { getByText, getByTestId } = await renderInTestApp(
+      <ThemeProvider theme={lightTheme}>
+        <RadarPage {...techRadarProps} />
+      </ThemeProvider>,
     );
 
     await waitForElement(() => getByTestId('tech-radar-svg'));
@@ -94,7 +95,7 @@ describe('RadarPage', () => {
       svgProps: { 'data-testid': 'tech-radar-svg' },
     };
 
-    const { queryByTestId } = render(
+    const { queryByTestId } = await renderInTestApp(
       <ThemeProvider theme={lightTheme}>
         <ApiProvider apis={ApiRegistry.with(errorApiRef, errorApi)}>
           <RadarPage {...techRadarProps} />