Switch to `uv2nix` #3564

Job	Run time
MyPy	2m 23s
Backup process	3m 38s
Formatting	2m 11s
Compile Scss	2m 4s
Linter	2m 45s
Build nix environment on MacOS	1m 22s
Test + Coverage	3m 44s
Test (shuffled order)	2m 50s
Render Html pages	2m 34s
Test Typescript	2m 36s
	26m 7s

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