Path Tracing denoiser is not stable in animation

When rendering an animation with the path tracer through MovieRenderQueue, at low sampling rates the denoiser produces splotchy results that flicker from frame to frame.

The current denoiser (OpenImageDenoise 1.4) only uses information from the current frame, but should ideally take the previous frame into account as well.

Steps:

1. Create or use a sequence.

2. Follow the steps to use NFOR in [Link Removed] to either use MRQ or MRG to render out a small video. Use enough samples based on the scene complexity. In the doc gif, the sample count is 128spp.

Expected: With NFOR denoiser, the video is much more temporal stable than OIDN.

[UE-23848] Bug Status

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