Revert "Licensing plugin and XPackInfo uses the same license data (#52507)"

This reverts commit 2b88256.

Author: spalger

x-pack/legacy/common/poller.d.ts

@@ -8,7 +8,4 @@ export declare class Poller {
   constructor(options: any);
 
   public start(): void;
-  public stop(): void;
-  public isRunning(): boolean;
-  public getPollFrequency(): number;
 }

x-pack/legacy/plugins/xpack_main/index.js

@@ -6,6 +6,9 @@
 
 import { resolve } from 'path';
 import dedent from 'dedent';
+import {
+  XPACK_INFO_API_DEFAULT_POLL_FREQUENCY_IN_MILLIS
+} from '../../server/lib/constants';
 import { mirrorPluginStatus } from '../../server/lib/mirror_plugin_status';
 import { replaceInjectedVars } from './server/lib/replace_injected_vars';
 import { setupXPackMain } from './server/lib/setup_xpack_main';
@@ -31,6 +34,7 @@ export const xpackMain = (kibana) => {
           enabled: Joi.boolean().default(),
           url: Joi.string().default(),
         }).default(), // deprecated
+        xpack_api_polling_frequency_millis: Joi.number().default(XPACK_INFO_API_DEFAULT_POLL_FREQUENCY_IN_MILLIS),
       }).default();
     },
 
@@ -43,9 +47,6 @@ export const xpackMain = (kibana) => {
     },
 
     uiExports: {
-      hacks: [
-        'plugins/xpack_main/hacks/check_xpack_info_change',
-      ],
       replaceInjectedVars,
       injectDefaultVars(server) {
         const config = server.config();

x-pack/legacy/plugins/xpack_main/public/hacks/check_xpack_info_change.js

@@ -4,13 +4,11 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-import { BehaviorSubject } from 'rxjs';
 import sinon from 'sinon';
 import { XPackInfo } from '../xpack_info';
 import { setupXPackMain } from '../setup_xpack_main';
 import * as InjectXPackInfoSignatureNS from '../inject_xpack_info_signature';
 
-
 describe('setupXPackMain()', () => {
   const sandbox = sinon.createSandbox();
 
@@ -41,16 +39,17 @@ describe('setupXPackMain()', () => {
         elasticsearch: mockElasticsearchPlugin,
         xpack_main: mockXPackMainPlugin
       },
-      newPlatform: { setup: { plugins: { features: {}, licensing: { license$: new BehaviorSubject() } } } },
+      newPlatform: { setup: { plugins: { features: {} } } },
       events: { on() {} },
       log() {},
       config() {},
       expose() {},
       ext() {}
     });
 
-    // Make sure plugins doesn't consume config
+    // Make sure we don't misspell config key.
     const configGetStub = sinon.stub().throws(new Error('`config.get` is called with unexpected key.'));
+    configGetStub.withArgs('xpack.xpack_main.xpack_api_polling_frequency_millis').returns(1234);
     mockServer.config.returns({ get: configGetStub });
   });