[Groom] Very thin hair has incorrect raytraced shadow on edges

This only happens when

1) Hair Width is very small. e.g. 0.01 in the example

2) Light has raytraced shadow and Samples Per Pixel has a value > 1. e.g. 8 in the example

The problem seems to be related with rasterization. r.HairStrands.RasterizationScale 0 workarounds ** it. If this is by design, it would be very helpful to reflect the parameter in the UI.

Open attached project to reproduce

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