[Test] Enable unit test suites in telemetry/public/components

All the unit tests related to unused telemetry are temporarily
skipped after the fork. Unit tests of the disabled telemetry
functions should also be modified correspondingly. To build
a clean unit test, we decide to modify and enable all the
working unit tests. This PR checks and enables in dir
src/plugins/telemetry/public/components, which includes:
1) opt_in_banner.test.tsx,
2) opt_in_message.test.tsx,
3) opted_in_notice_banner.test.tsx

Signed-off-by: Anan Zhuang <[email protected]>

src/plugins/telemetry/public/components/opt_in_banner.test.tsx

@@ -34,7 +34,7 @@ import { EuiButton } from '@elastic/eui';
 import { shallowWithIntl } from 'test_utils/enzyme_helpers';
 import { OptInBanner } from './opt_in_banner';
 
-describe.skip('OptInDetailsComponent', () => {
+describe('OptInDetailsComponent', () => {
   it('renders as expected', () => {
     expect(shallowWithIntl(<OptInBanner onChangeOptInClick={() => {}} />)).toMatchSnapshot();
   });

src/plugins/telemetry/public/components/opt_in_message.test.tsx

@@ -33,7 +33,7 @@ import React from 'react';
 import { shallowWithIntl } from 'test_utils/enzyme_helpers';
 import { OptInMessage } from './opt_in_message';
 
-describe.skip('OptInMessage', () => {
+describe('OptInMessage', () => {
   it('renders as expected', () => {
     expect(shallowWithIntl(<OptInMessage />)).toMatchSnapshot();
   });

src/plugins/telemetry/public/components/opted_in_notice_banner.test.tsx

@@ -34,7 +34,7 @@ import { EuiButton } from '@elastic/eui';
 import { shallowWithIntl } from 'test_utils/enzyme_helpers';
 import { OptedInNoticeBanner } from './opted_in_notice_banner';
 
-describe.skip('OptInDetailsComponent', () => {
+describe('OptInDetailsComponent', () => {
   it('renders as expected', () => {
     expect(shallowWithIntl(<OptedInNoticeBanner onSeenBanner={() => {}} />)).toMatchSnapshot();
   });