[Bug]: `build` and `setuptools` being missing produces odd errors

[arrdem]

What happened?

In order for us to do sdist builds for users, we need build at a minimum and often wheel and setuptools too. The UV extension produces the very much not obvious error

Error in fail: Unable to resolve a default version for requirement "build" in @@//cases/uv-default-version-xxx:uv.lock

if the user hasn't provided these dependencies. We should try to provide a more specific warning if we can.

Version

Development (host) and target OS/architectures:

Output of bazel --version:

Version of the Aspect rules, or other relevant rules from your
WORKSPACE or MODULE.bazel file:

Language(s) and/or frameworks involved:

How to reproduce

Any other information?

No response