Enable VS Code usage via code-server

[maxrjones]

This PR partly addresses https://github.com/NASA-IMPACT/veda-analytics/issues/117 by adding code-server and installing VS Code extensions using the approach proposed in https://github.com/NASA-IMPACT/veda-analytics/issues/117#issuecomment-2259214346.

[batpad]

Thanks for this @maxrjones !

@sunu would you be able to help review?

@yuvipanda I'd love to get your thoughts on whether we should include things like this in the default image. There's also #20 to enable Jupyter RTC. It seems to me like having separate images starts leading to a lot of permutations and combinations and I think that it would be nice to have better VS Code integration and the ability to do real-time collaboration just in the default image?

And, this seems different enough for the base pangeo image use-case that we shouldn't upstream into the pangeo image, so this seems like a good place for it?

I don't have any strong opinions here - if you feel like it's better to create separate images for these use-cases, we can do that as well and include it in the profile image selection drop-down.

Thanks @maxrjones ! I merged your fix for the failing test in #21 so hopefully rebasing on main will fix the failing test.

[batpad]

@maxrjones once this image is getting pushed successfully, could you write a quick "how to test this".

[sunu]

@batpad I tested this locally with the following steps:

1. Checked out the branch locally and built the image:

git checkout vscode
docker build -t veda-vscode .

2. Started a jupyterlab instance using the built image:

docker run -it -p 8888:8888 --security-opt seccomp=unconfined veda-vscode jupyter lab

3. Opened the home page and clicked on the vscode launcher which opened a functional vscode instance for me.
4. I clicked on the "extensions" icon on the left sidebar of the VS Code instance and it listed all the installed extensions.

[yuvipanda]

Ya, i think it's fine to add this here. We should also figure out how to support this upstream (probably becomes an image variant), but is fine here. same with jupyter_collaboration.