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Previously, we pulled in the shared tree-sitter extractor via a `git` dependency in `Cargo.toml` to address a `rules_rust` limitation (no `path` dependencies outside of the cargo workspace)). This was a problem, as that means we're cloning `github/codeql` _again_ for the build, which is quite slow. I found another way that is faster, and still produces correct builds for both `cargo`` and `rules_rust`: * Cargo depends on a fake crate that has the same dependencies as the real crate (thanks to `sync-files.py`). Therefore, cargo pulls in the right dependencies into the lockfile, which bazel targets * For local builds, we override the path to that dependency in a cargo config, so we're pulling in the correct code * rules_rust only uses `path` dependencies for collecting transitive dependencies, it never pulls in the code from there. So far that, we manually provide a `BUILD.bazel` file for the shared extractor, and depend on that.