PackFloat2To8 is broken in packing.hlsl

Steps to reproduce:

1. Unzip and open attached project

2. Look at the rendering of the scene (game view):

Actual results: "Original" result shows green banding

Expected results: "Original" result should be closer to "Reference" (it should be "Fixed")

Reproducible with versions: Reproduced with 2022.3.19f1 but github shows no change to this for years (so also on 2021.3 lts & 2023.3 ...)

Not reproducible with versions: 

Can’t test with versions: 

Tested on (OS): Windows

Notes:

• The issue was raised following a discussion with user on Discord. The user wanted to use the function to pack data, and it appears it is not used at all in our code.