Remove Node Feature and directly install 'nvm' wherever necessary

> Node is optional. it's not necessary for a python project. Therefore, ESLint should be optional too.
> I propose removing node features from Python and Miniconda images. Users should add them to their devcontainer.json if they need them.
>
> It is annoying to uninstall ESLint to see them again every time I rebuild the image. ESLint wasn't included previously in the image.

_Originally posted by @Uguudei in https://github.com/devcontainers/images/issues/243#issuecomment-1429032491_