Color shifting occurs from screen probe gather ping-pong when Lumen active

A subtle yellow tint color shift occurs when Lumen is active due to usage of R11G11B10_Float targets, mostly from r.Lumen.ScreenProbeGather.SpatialFilterProbes where we ping-pong between R11G11B10_Float targets multiple times.

One proposed solution is to allow changing the target formats to R9G9B9E5_SHAREDEXP  which involves RHI support.

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1. In a project with Lumen active, create an empty level with a white plane and a skylight
2. Add a post-process volume and set the Saturation to 5.0
3. Set r.Lumen.ScreenProbeGather.SpatialFilterNumPasses 0 
4. Set r.Lumen.ScreenProbeGather.SpatialFilterNumPasses 10

Expected
The tint of plane remains the same no matter how many spatial filter passes are used

Actual
The tint of the plane because more yellow as the number of passes increases, and the default value is 3 which shows that a subtle yellow tint is added to scenes from the filter.

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