[rickeylev]

Now that the uv lock() macro supports WORKSPACE builds, remaining
non-dedicated compile_pip_requirements targets and pip-compile
lockfiles can use uv instead.

Migrate tests/multiple_inputs to lock() with diff_test, register
uv toolchains in the example WORKSPACE and MODULE.bazel files, and
regenerate the example requirements*.txt files with uv.

[rickeylev]

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[dougthor42]

Should we keep some non-uv examples in case people want slow stuff? Or in case uv becomes enshittified and people want to switch back?

[rickeylev]

I think we should keep the docs and tests as long as we support it.

I'm torn about what compile_pip_requirement's future is, though. I like the idea of supporting all the different lockers (pycross supports some other lockers), however, we need owners who are interested in supporting them.