Canvas2D 的 getImageData 操作建议设置 willReadFrequently 属性为 true 以提高性能

[xbpiao]

参考：https://html.spec.whatwg.org/multipage/canvas.html#concept-canvas-will-read-frequently

在 texture-cube.ts 文件中，当创建 Canvas2D 上下文时，没有设置 willReadFrequently 属性为 true，导致多次使用 getImageData 时性能较差。

Re: # 重现步骤：新建Hello World工程，使用Chrome版本 144.0.7559.110（正式版本） （64 位）预览发现错误

把错误扔给TRAE修复

修复后没有错误

Changelog

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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.

[greptile-apps]

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[github-actions]

Code Size Check Report

Wechat (WASM)	Before	After	Diff
2D Empty (legacy pipeline)	1009738 bytes	1009762 bytes	⚠️ +24 bytes
2D All (legacy pipeline)	2675347 bytes	2675371 bytes	⚠️ +24 bytes
2D All (new pipeline)	2767083 bytes	2767107 bytes	⚠️ +24 bytes
(2D + 3D) All	10024081 bytes	10024105 bytes	⚠️ +24 bytes

Web (WASM + ASMJS)	Before	After	Diff
(2D + 3D) All	16843143 bytes	16843167 bytes	⚠️ +24 bytes

Interface Check Report

This pull request does not change any public interfaces !

[xbpiao]

不用这个天空盒子sunnySkyBox_reflection，只要Remove然后删除sunnySkyBox_reflection和sunnySkyBox_reflection_convolution就不会有这个警告了。

所以这个PR也没必要