feat(docs-infra): use angular-ts and angular-html shiki highlighting (angular#59004)

Use `angular-ts` instead of `typescript` and `angular-html` instead of `html`.

PR Close angular#59004

Author: hawkgs

adev/shared-docs/pipeline/api-gen/extraction/interpolate_code_examples.ts

@@ -28,9 +28,9 @@ type FileType = 'ts' | 'js' | 'html';
 type RegionStartToken = {name: string; startIdx: number};
 
 const MD_CTYPE_MAP: {[key in FileType]: string} = {
-  'ts': 'typescript',
+  'ts': 'angular-ts',
   'js': 'javascript',
-  'html': 'html',
+  'html': 'angular-html',
 };
 
 /**

adev/shared-docs/pipeline/api-gen/extraction/test/interpolate_code_examples.spec.ts

@@ -11,8 +11,8 @@ import {interpolateCodeExamples} from '../interpolate_code_examples';
 import {DocEntry} from '@angular/compiler-cli';
 import {mockReadFileSync} from './fake-examples';
 
-const tsMdBlock = (code: string) => '```typescript\n' + code + '\n```';
-const htmlMdBlock = (code: string) => '```html\n' + code + '\n```';
+const tsMdBlock = (code: string) => '```angular-ts\n' + code + '\n```';
+const htmlMdBlock = (code: string) => '```angular-html\n' + code + '\n```';
 
 const entriesBuilder = (comment: string): DocEntry[] => [
   {jsdocTags: [], rawComment: comment} as unknown as DocEntry,