Unable to affect setting cubemap blend in skyLight and reflections on transluscent materials

Attempting to blend SkyLight Cubemaps via the SetCubemapBlend function to blend between different Cubemaps to make the changes seamless is not reflected.

As a workaround, in LumenTracingCommon.ush, replace GetSkyLightReflection with GetSkyLightReflectionSupportingBlend to apply the blend. This is also mentioned in the following thread. 

https://forums.unrealengine.com/t/set-cubemap-blend-in-skylight-and-reflections-on-transluscent-materials/137795/3

1. Download the repro project in additonal Info URL
2. Open in editor
3. Play in editor

Result:

When changing the value of InBlendFraction, only A or B is reflected and not blended.

Expected:

When blending via the SetCubemapBlend function, A and B are blended according to the input InBlendFraction value.

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