[Bug]: UV locks may contain no sdist

[arrdem]

What happened?

It's legal to get the following lockfile state as a result of whl install urls used as requirements which can happen when users have manually created prebuilds. Also some libraries like pywin32 just don't ship sdists.

In this case the UV extension needs to just not generate the sdist build codepath.

Lack of this behavior breaks bazel build @<hub>//... with configuration errors and will also impact query.

[[package]]
name = "pywin32"
version = "311"
source = { registry = "https://pypi.org/simple" }
wheels = [
   # ...
]

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