Support uv pip compile on uv manager

[mkniewallner]

Tell us more.

Support for uv manager was added in #30756, which closed #27841, but the PR only added a partial implementation, as uv supports 2 different ways of locking dependencies:

• universal one with uv.lock output, which the PR implemented
• pip-tools-like one with requirements.txt output, through uv pip compile, which was the initial discussion of the issue

Having a dedicated issue for the 2nd item would make it easier to track support for it as well.

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[rarkins]

Converted to issue #30909 but also needs a reproduction

[mkniewallner]

There was one at https://github.com/renovate-reproductions/27841 in the original issue.