Telemetry usage collection welcome screen (#53084)

* Changes text dynamically based on the value of optIn in kibana.yml

src/legacy/core_plugins/kibana/public/home/components/home.js

@@ -51,10 +51,7 @@ export class Home extends Component {
       getServices().getInjected('disableWelcomeScreen') ||
       props.localStorage.getItem(KEY_ENABLE_WELCOME) === 'false'
     );
-    const showTelemetryDisclaimer = getServices().getInjected(
-      'telemetryNotifyUserAboutOptInDefault'
-    );
-
+    const currentOptInStatus = this.props.getOptInStatus();
     this.state = {
       // If welcome is enabled, we wait for loading to complete
       // before rendering. This prevents an annoying flickering
@@ -63,7 +60,7 @@ export class Home extends Component {
       isLoading: isWelcomeEnabled,
       isNewKibanaInstance: false,
       isWelcomeEnabled,
-      showTelemetryDisclaimer,
+      currentOptInStatus,
     };
   }
 
@@ -222,14 +219,13 @@ export class Home extends Component {
   renderLoading() {
     return '';
   }
-
   renderWelcome() {
     return (
       <Welcome
         onSkip={this.skipWelcome}
         urlBasePath={this.props.urlBasePath}
-        showTelemetryDisclaimer={this.state.showTelemetryDisclaimer}
         onOptInSeen={this.props.onOptInSeen}
+        currentOptInStatus={this.state.currentOptInStatus}
       />
     );
   }
@@ -269,4 +265,5 @@ Home.propTypes = {
   urlBasePath: PropTypes.string.isRequired,
   mlEnabled: PropTypes.bool.isRequired,
   onOptInSeen: PropTypes.func.isRequired,
+  getOptInStatus: PropTypes.func.isRequired,
 };

src/legacy/core_plugins/kibana/public/home/components/home.test.js

@@ -63,6 +63,10 @@ describe('home', () => {
         setItem: sinon.mock(),
       },
       urlBasePath: 'goober',
+      onOptInSeen() {
+        return false;
+      },
+      getOptInStatus: jest.fn(),
     };
   });
 

src/legacy/core_plugins/kibana/public/home/components/home_app.js

@@ -29,14 +29,13 @@ import { getTutorial } from '../load_tutorials';
 import { replaceTemplateStrings } from './tutorial/replace_template_strings';
 import { getServices } from '../kibana_services';
 import { npSetup } from 'ui/new_platform';
-
 export function HomeApp({ directories }) {
   const {
     getInjected,
     savedObjectsClient,
     getBasePath,
     addBasePath,
-    telemetryOptInProvider: { setOptInNoticeSeen },
+    telemetryOptInProvider: { setOptInNoticeSeen, getOptIn },
   } = getServices();
   const { cloud } = npSetup.plugins;
   const isCloudEnabled = !!(cloud && cloud.isCloudEnabled);
@@ -87,6 +86,7 @@ export function HomeApp({ directories }) {
               localStorage={localStorage}
               urlBasePath={getBasePath()}
               onOptInSeen={setOptInNoticeSeen}
+              getOptInStatus={getOptIn}
             />
           </Route>
           <Route path="/home">