refactor(compiler): ensure compatibility with typescript strict flag (#30993)

As part of FW-1265, the `@angular/compiler` package is made compatible
with the TypeScript `--strict` flag. This already unveiled a few bugs,
so the strictness flag seems to help with increasing the overall code health.

Read more about the strict flag [here](https://www.typescriptlang.org/docs/handbook/compiler-options.html)

PR Close #30993

packages/compiler/src/template_parser/template_ast.ts

@@ -359,7 +359,7 @@ export class RecursiveTemplateAstVisitor extends NullTemplateVisitor implements
       if (children && children.length) results.push(templateVisitAll(t, children, context));
     }
     cb(visit);
-    return [].concat.apply([], results);
+    return Array.prototype.concat.apply([], results);
   }
 }