fix: Only apply `cfg(test)` for local crates
Don't analyze dependencies with `test`; this should fix various cases where crates use `cfg(not(test))` and so we didn't find things.
"Local" here currently means anything that's not from the registry, so anything inside the workspace, but also path dependencies. So this isn't perfect, and users might still need to use `rust-analyzer.cargo.unsetTest` for these in some cases.
312ac83caf