message: Use plain cargo to test runtime crates instead of gradle
diff: @@ -60,19 +60,29 @@ Some components, such as `codegen-client-test` and `codegen-server-test`, are pu
  To test the `rust-runtime` crates:
  ```bash
  -# Run all Rust tests for `rust-runtime/`
  -./gradlew rust-runtime:cargoTest
  -# Run clippy for `rust-runtime/`
  -./gradlew rust-runtime:cargoClippy
  +# Run all Rust tests for `rust-runtime/` (from repo root):
  +cargo test --manifest-path=rust-runtime/Cargo.toml
  +# Run clippy for `rust-runtime/` (from repo root):
  +cargo clippy --manifest-path=rust-runtime/Cargo.toml
  +
  +# Or
  +cd rust-runtime
  +cargo test
  +cargo clippy
  ```
  -For `aws/rust-runtime`, just prefix with `aws:`:
  +To test the `aws/rust-runtime` crates:
  ```bash
  -# Run all Rust tests for `rust-runtime/`
  -./gradlew aws:rust-runtime:cargoTest
  -# Run clippy for `rust-runtime/`
  -./gradlew aws:rust-runtime:cargoClippy
  +# Run all Rust tests for `aws/rust-runtime/` (from repo root):
  +cargo test --manifest-path=aws/rust-runtime/Cargo.toml
  +# Run clippy for `aws/rust-runtime/` (from repo root):
  +cargo clippy --manifest-path=aws/rust-runtime/Cargo.toml
  +
  +# Or
  +cd aws/rust-runtime
  +cargo test
  +cargo clippy
  ```
  Some runtime crates have a `additional-ci` script that can also be run. These scripts often require
  