XboxOne D3D12 Graphics Artifacts

Multiple licensees are experiencing this problem. The repro should look like this initially:

[Image Removed]

But then over time will degrade overtime into something like this this, most likely caused by a PSO caching + shader mismatch error:
[Image Removed]

1.  Download 4.21 project repro provided by licensee - [Link Removed]
2. Deploy to XboxOne on 180604 / October 2018
3. Y is set to "Seamless Server Travel", forcing the the level to reload.
4. Keep pressing Y until artifacts begin to appear (usually around 10-20 presses, frequency seems to increase).

Fix UE-51650

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