uv

de868ed1 - Allow `uv pip compile` to install missing python interpreters in cases where it would otherwise fail (#17216)

Allow `uv pip compile` to install missing python interpreters in cases where it would otherwise fail (#17216) ## Summary Partially address #16709. Previously, if cornered, `pip compile` would fail when the requested python interpreter couldn't be found (more details in the issue and comments), and now in those cases it will download it. ## Test Plan Added an integration test for this case.