fix bug: AnimationController does not override clips in PoseGraph

[jcyuan]

bug desc: #19162

While fixing this BUG, I initially thought it was simply a missing loop for _proceduralPoseStates in state-machine-eval.ts:

    public overrideClips (context: AnimationGraphBindingContext): void {
        ...............
        const { _proceduralPoseStates: proceduralPoseStates } = this;
        const nProcedural = proceduralPoseStates.length;
        for (let iProcedural = 0; iProcedural < nProcedural; ++iProcedural) {
            proceduralPoseStates[iProcedural].overrideClips(context);
        }
    }

However, during the fix, I discovered that the entire ProceduralPoseState was not designed with an overrideClip mechanism at all. So I'm unclear why the official team did it this way... was this functionality accidentally omitted? Or was it never intended for ProceduralPoseState to have clip override capabilities? If this was intentional, please let me know the reason, as this global replacement is crucial for our current animation feature implementation. Thank you!

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Code Size Check Report

Wechat (WASM)	Before	After	Diff
2D Empty (legacy pipeline)	1009738 bytes	1009738 bytes	✅ 0 bytes
2D All (legacy pipeline)	2675347 bytes	2675347 bytes	✅ 0 bytes
2D All (new pipeline)	2767083 bytes	2767083 bytes	✅ 0 bytes
(2D + 3D) All	10024081 bytes	10024648 bytes	⚠️ +567 bytes

Web (WASM + ASMJS)	Before	After	Diff
(2D + 3D) All	16843143 bytes	16843710 bytes	⚠️ +567 bytes

Interface Check Report

This pull request does not change any public interfaces !

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