Rust Cargo linter: Improve workspace support (#1679)

* Rust Cargo linter: Improve workspace support

When using Cargo workspaces [1], there is a 'Cargo.toml' directory in a
top level directory, listing all the crates in the project. If we are
currently editing one of the crates, 'cargo build' should execute in
that directory for that crate's separate `Cargo.toml`, otherwise Cargo
may spend more time possibly rebuilding the entire workspace, and maybe
failing on one of the other crates, instead of succeeding on the current.

[1] https://doc.rust-lang.org/book/second-edition/ch14-03-cargo-workspaces.html

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