refactor(ivy): clean up ngtsc code (#30238)

No behavioural changes.

PR Close #30238

packages/compiler-cli/src/ngtsc/annotations/test/directive_spec.ts

@@ -5,9 +5,6 @@
  * Use of this source code is governed by an MIT-style license that can be
  * found in the LICENSE file at https://angular.io/license
  */
-
-import * as ts from 'typescript';
-
 import {NOOP_DEFAULT_IMPORT_RECORDER, ReferenceEmitter} from '../../imports';
 import {DtsMetadataReader, LocalMetadataRegistry} from '../../metadata';
 import {PartialEvaluator} from '../../partial_evaluator';