Add medical image denoising demo for anisotropic diffusion#3997

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m-wisell wants to merge 3 commits intoFEniCS:mainfrom

m-wisell:demo/medical-image-denoising

Commits on Nov 20, 2025

WIP: Add medical image denoising demo for anisotropic diffusion
m-wisell
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Commits on Dec 11, 2025

Fix CI Issues: Consolidate to Single Demo with Comprehensive Tests
m-wisell
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Removed utils/directory - demo modified to be standalone file
m-wisell
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