refactor(language-service): Remove redudant 'TemplateInfo' type (#32250)

The TemplateInfo type is an extension of AstResult, but it is not
necessary at all. Instead, improve the current interface for AstResult
by removing all optional fileds and include the TemplateSource in
AstResult instead.

PR Close #32250

packages/language-service/src/template.ts

@@ -8,6 +8,8 @@
 
 import {getClassMembersFromDeclaration, getPipesTable, getSymbolQuery} from '@angular/compiler-cli';
 import * as ts from 'typescript';
+
+import {isAstResult} from './common';
 import * as ng from './types';
 import {TypeScriptServiceHost} from './typescript_host';
 
@@ -67,7 +69,8 @@ abstract class BaseTemplate implements ng.TemplateSource {
         // TODO: There is circular dependency here between TemplateSource and
         // TypeScriptHost. Consider refactoring the code to break this cycle.
         const ast = this.host.getTemplateAst(this);
-        return getPipesTable(sourceFile, program, typeChecker, ast.pipes || []);
+        const pipes = isAstResult(ast) ? ast.pipes : [];
+        return getPipesTable(sourceFile, program, typeChecker, pipes);
       });
     }
     return this.queryCache;