feat(node): 使setWorldPosition方法的z参数变为可选参数

[orchid-world]

使Node类的setWorldPosition方法的z轴参数变为可选参数，当z参数未提供时，
默认使用当前节点的世界位置的z值。这增强了API的灵活性，允许开发者在
设置世界位置时只指定x和y坐标。

Re: #

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.

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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)	1010278 bytes	1010300 bytes	⚠️ +22 bytes
2D All (legacy pipeline)	2675898 bytes	2675920 bytes	⚠️ +22 bytes
2D All (new pipeline)	2767635 bytes	2767657 bytes	⚠️ +22 bytes
(2D + 3D) All	10024632 bytes	10024654 bytes	⚠️ +22 bytes

Web (WASM + ASMJS)	Before	After	Diff
(2D + 3D) All	16843200 bytes	16843222 bytes	⚠️ +22 bytes

Interface Check Report

! WARNING this pull request has changed these public interfaces:

@@ -25064,9 +25064,9 @@
          * @param x X axis position
          * @param y Y axis position
          * @param z Z axis position
          */
-        setWorldPosition(x: number, y: number, z: number): void;
+        setWorldPosition(x: number, y: number, z?: number): void;
         /**
          * @en Get position in world coordinate system, please try to pass `out` vector and reuse it to avoid garbage.
          * @zh 获取世界坐标，注意，尽可能传递复用的 [[Vec3]] 以避免产生垃圾。
          * @param out Set the result to out vector

[github-actions]

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