uv

c9eeaafc - Add a cache directory builder to test contexts (#21120)

Add a cache directory builder to test contexts (#21120) Tests that replace `TestContext.cache_dir` directly leave snapshot filters pointing at the original cache, and command-level `UV_CACHE_DIR` overrides are ignored because the context supplies `--cache-dir`. Add `TestContext::with_cache_dir` to configure the effective cache and its snapshot filters together, resolve relative paths against the test working directory, and use the builder for shared ecosystem caches. --------- Co-authored-by: Zanie Blue <contact@zanie.dev>