[Console] Remove unused code (elastic#59554)

* Remove unused code

* fix: remove use of undeclared variable

Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>

src/plugins/console/public/application/index.tsx

@@ -22,16 +22,11 @@ import { render, unmountComponentAtNode } from 'react-dom';
 import { NotificationsSetup } from 'src/core/public';
 import { ServicesContextProvider, EditorContextProvider, RequestContextProvider } from './contexts';
 import { Main } from './containers';
-import { createStorage, createHistory, createSettings, Settings } from '../services';
+import { createStorage, createHistory, createSettings } from '../services';
 import * as localStorageObjectClient from '../lib/local_storage_object_client';
 import { createUsageTracker } from '../services/tracker';
 import { UsageCollectionSetup } from '../../../usage_collection/public';
 
-let settingsRef: Settings;
-export function legacyBackDoorToSettings() {
-  return settingsRef;
-}
-
 export interface BootDependencies {
   docLinkVersion: string;
   I18nContext: any;
@@ -59,7 +54,6 @@ export function renderApp({
   const history = createHistory({ storage });
   const settings = createSettings({ storage });
   const objectStorageClient = localStorageObjectClient.create(storage);
-  settingsRef = settings;
 
   render(
     <I18nContext>

src/plugins/console/public/application/models/sense_editor/sense_editor.test.mocks.ts

@@ -20,9 +20,6 @@
 
 import '../legacy_core_editor/legacy_core_editor.test.mocks';
 
-// TODO: Remove this mock
-jest.mock('../../../application', () => ({ legacyBackDoorToSettings: () => {} }));
-
 import jQuery from 'jquery';
 jest.spyOn(jQuery, 'ajax').mockImplementation(
   () =>