Don't show telemetry opt-in/out notice when it has been disabled via …

…yml config. (elastic#116867)

src/plugins/home/public/application/components/welcome.test.tsx

@@ -47,6 +47,14 @@ test('should render a Welcome screen with no telemetry disclaimer', () => {
   expect(component).toMatchSnapshot();
 });
 
+test('should render a Welcome screen without the opt in/out link when user cannot change optIn status', () => {
+  const telemetry = telemetryPluginMock.createStartContract();
+  telemetry.telemetryService.getCanChangeOptInStatus = jest.fn().mockReturnValue(false);
+  const component = shallow(<Welcome urlBasePath="/" onSkip={() => {}} telemetry={telemetry} />);
+
+  expect(component).toMatchSnapshot();
+});
+
 test('fires opt-in seen when mounted', () => {
   const telemetry = telemetryPluginMock.createStartContract();
   const mockSetOptedInNoticeSeen = jest.fn();

src/plugins/home/public/application/components/welcome.tsx

@@ -77,7 +77,11 @@ export class Welcome extends React.Component<Props> {
 
   private renderTelemetryEnabledOrDisabledText = () => {
     const { telemetry } = this.props;
-    if (!telemetry || !telemetry.telemetryService.userCanChangeSettings) {
+    if (
+      !telemetry ||
+      !telemetry.telemetryService.userCanChangeSettings ||
+      !telemetry.telemetryService.getCanChangeOptInStatus()
+    ) {
       return null;
     }