Fix installing dependencies in tutorials

[Warvito]

In some tutorials, it checks if the dependencies are available, and if not, it install them. For example:

GenerativeModels/tutorials/generative/3d_autoencoderkl/3d_autoencoderkl_tutorial.py

Line 30 in e135f42

# !python -c "import monai" || pip install -q "monai-weekly[pillow, tqdm, einops, nibabel]"

In some case, these dependencies are not relevant, and should be remove from the tutorial

[Warvito]

MONAI Tutorials is now adopting having the LICENSE as the first thing in the tutorials. We should fix it in our examples