fix Skeleton's opacity can not work normally #17497
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Re: #
#16960
#16601
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Greptile Summary
This PR addresses issues with Skeleton opacity in the Cocos Engine, implementing changes to ensure proper opacity handling across different rendering modes.
cocos/spine/assembler/simple.ts
to use a more precise EPSILON comparison for opacity calculationscocos/spine/skeleton.ts
to include node opacity in alpha value calculations for the_updateColor
methodSkeletonCacheAnimation::render
in native C++ code to incorporate entity opacity in final color calculationsSkeletonRenderer::render
in native C++ code to include entity opacity in the opacity calculation