Update batcher-2d.ts , 删除无用代码

[finscn]

删除不再使用的 commitIA() 方法.
这个 Batcher2D 类你们从来没有暴路出来过 , cocos 的用户们几乎不可能用到 commitIA() 方法.
而你们代码内部 也没有用.
因为 @deprecated since v3.6.2, please use [[commitMiddleware]] instead .

现在你们内部都在用 commitMiddleware 了.

所以这个 方法删了吧.
你们不是总想着缩小代码体积吗, 这种没用过的方法能删尽量删吧.

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)	1009429 bytes	1008868 bytes	👍 -561 bytes
2D All (legacy pipeline)	2674774 bytes	2674213 bytes	👍 -561 bytes
2D All (new pipeline)	2765676 bytes	2765115 bytes	👍 -561 bytes
(2D + 3D) All	10022031 bytes	10021466 bytes	👍 -565 bytes

Web (WASM + ASMJS)	Before	After	Diff
(2D + 3D) All	16841090 bytes	16840525 bytes	👍 -565 bytes

Interface Check Report

! WARNING this pull request has changed these public interfaces:

@@ -3682,22 +3682,8 @@
          */
         commitComp(comp: UIRenderer, renderData: BaseRenderData | null, frame: __private._cocos_asset_assets_texture_base__TextureBase | SpriteFrame | null, assembler: IAssembler, transform: Node | null): void;
         /**
          * @en
-         * Render component data submission process for individual [[gfx.InputAssembler]]
-         * @zh
-         * 渲染组件中针对独立 [[gfx.InputAssembler]] 的提交流程
-         * 例如：Spine 和 DragonBones 等包含动态数据和材质的组件在内部管理 IA 并提交批次
-         * @param comp - The committed renderable component
-         * @param ia - The committed [[gfx.InputAssembler]]
-         * @param tex - The texture used
-         * @param mat - The material used
-         * @param [transform] - The related node transform if the render data is based on node's local coordinates
-         * @deprecated since v3.6.2, please use [[commitMiddleware]] instead
-         */
-        commitIA(renderComp: UIRenderer, ia: gfx.InputAssembler, tex?: __private._cocos_asset_assets_texture_base__TextureBase, mat?: Material, transform?: Node): void;
-        /**
-         * @en
          * Render component data submission process for middleware2d components
          * @zh
          * 渲染组件中针对2D中间件组件渲染数据的提交流程
          * 例如：Spine 和 DragonBones 包含动态数据和材质的组件