Use docLinks API for APM doc links (elastic#61880)

* Use docLinks API for APM doc links

Remove `packageInfo` (from ui/metadata package from the legacy platform) and replace with `core.dockLinks` in the `ElasticDocsLink` component.

Fixes elastic#56453
Fixes elastic#60945

x-pack/legacy/plugins/apm/public/components/shared/Links/ElasticDocsLink.tsx

@@ -4,8 +4,8 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-import React from 'react';
 import { EuiLink, EuiLinkAnchorProps } from '@elastic/eui';
+import React from 'react';
 import { useApmPluginContext } from '../../../hooks/useApmPluginContext';
 
 // union type constisting of valid guide sections that we link to
@@ -17,8 +17,11 @@ interface Props extends EuiLinkAnchorProps {
 }
 
 export function ElasticDocsLink({ section, path, children, ...rest }: Props) {
-  const { version } = useApmPluginContext().packageInfo;
-  const href = `https://www.elastic.co/guide/en${section}/${version}${path}`;
+  const { docLinks } = useApmPluginContext().core;
+  const baseUrl = docLinks.ELASTIC_WEBSITE_URL;
+  const version = docLinks.DOC_LINK_VERSION;
+  const href = `${baseUrl}guide/en${section}/${version}${path}`;
+
   return typeof children === 'function' ? (
     children(href)
   ) : (

x-pack/legacy/plugins/apm/public/context/ApmPluginContext/MockApmPluginContext.tsx

@@ -12,6 +12,10 @@ const mockCore = {
   chrome: {
     setBreadcrumbs: () => {}
   },
+  docLinks: {
+    DOC_LINK_VERSION: '0',
+    ELASTIC_WEBSITE_URL: 'https://www.elastic.co/'
+  },
   http: {
     basePath: {
       prepend: (path: string) => `/basepath${path}`
@@ -36,7 +40,6 @@ const mockConfig: ConfigSchema = {
 export const mockApmPluginContextValue = {
   config: mockConfig,
   core: mockCore,
-  packageInfo: { version: '0' },
   plugins: {}
 };
 

x-pack/legacy/plugins/apm/public/context/ApmPluginContext/index.tsx

@@ -5,15 +5,14 @@
  */
 
 import { createContext } from 'react';
-import { AppMountContext, PackageInfo } from 'kibana/public';
+import { AppMountContext } from 'kibana/public';
 import { ApmPluginSetupDeps, ConfigSchema } from '../../new-platform/plugin';
 
 export type AppMountContextBasePath = AppMountContext['core']['http']['basePath'];
 
 export interface ApmPluginContextValue {
   config: ConfigSchema;
   core: AppMountContext['core'];
-  packageInfo: PackageInfo;
   plugins: ApmPluginSetupDeps;
 }
 

x-pack/legacy/plugins/apm/public/new-platform/plugin.tsx

@@ -8,13 +8,11 @@ import React from 'react';
 import ReactDOM from 'react-dom';
 import { Route, Router, Switch } from 'react-router-dom';
 import styled from 'styled-components';
-import { metadata } from 'ui/metadata';
 import { i18n } from '@kbn/i18n';
 import { AlertType } from '../../../../../plugins/apm/common/alert_types';
 import {
   CoreSetup,
   CoreStart,
-  PackageInfo,
   Plugin,
   PluginInitializerContext
 } from '../../../../../../src/core/public';
@@ -123,14 +121,6 @@ export class ApmPlugin
     // Until then we use a shim to get it from legacy injectedMetadata:
     const config = getConfigFromInjectedMetadata();
 
-    // Once we're actually an NP plugin we'll get the package info from the
-    // initializerContext like:
-    //
-    //     const packageInfo = this.initializerContext.env.packageInfo
-    //
-    // Until then we use a shim to get it from legacy metadata:
-    const packageInfo = metadata as PackageInfo;
-
     // render APM feedback link in global help menu
     setHelpExtension(core);
     setReadonlyBadge(core);
@@ -139,7 +129,6 @@ export class ApmPlugin
     const apmPluginContextValue = {
       config,
       core,
-      packageInfo,
       plugins
     };