remove unused code

[star-e]

Re: #

Changelog

---

Continuous Integration

This pull request:

• needs automatic test cases check.

  Manual trigger with @cocos-robot run test cases afterward.

• does not change any runtime related code or build configuration

  If any reviewer thinks the CI checks are needed, please uncheck this option, then close and reopen the issue.

---

Compatibility Check

This pull request:

• changes public API, and have ensured backward compatibility with deprecated features.
• affects platform compatibility, e.g. system version, browser version, platform sdk version, platform toolchain, language version, hardware compatibility etc.
• affects file structure of the build package or build configuration which requires user project upgrade.
• introduces breaking changes, please list all changes, affected features and the scope of violation.

[github-actions]

Code Size Check Report

Wechat (WASM)	Before	After	Diff
2D Empty (legacy pipeline)	1005759 bytes	1005759 bytes	✅ 0 bytes
2D All (legacy pipeline)	2669390 bytes	2669390 bytes	✅ 0 bytes
2D All (new pipeline)	2757897 bytes	2757897 bytes	✅ 0 bytes
(2D + 3D) All	10013781 bytes	10013781 bytes	✅ 0 bytes

Web (WASM + ASMJS)	Before	After	Diff
(2D + 3D) All	16830970 bytes	16830970 bytes	✅ 0 bytes

Interface Check Report

This pull request does not change any public interfaces !

[star-e]

@cocos-robot run-test-cases-custom

[github-actions]

@star-e, Please check the result of run test cases:

• Test Platform: PR-Test
• Editor Version: v3.8.7
• Task Result: PASS
• Task URL: https://cctest.cocos.org/#/reportview/PR-TEST/3c909da1-5917-4623-9fdd-e985574a3df8/-1
• GitHub Action: https://github.com/cocos/cocos-engine/actions/runs/14903193310

Task Details

[github-actions]

@star-e, Please check the result of run test cases:

• Test Platform: PR-Test
• Editor Version: v3.8.7
• Task Result: PASS
• Task URL: https://cctest.cocos.org/#/reportview/PR-TEST/52302a0b-e163-4ea8-be74-0cbceb784c64/-1
• GitHub Action: https://github.com/cocos/cocos-engine/actions/runs/14903193310

Task Details