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rustdoc: Add attribute-related tests for rustdoc JSON. Add rustdoc JSON tests covering the use of the following attributes: - `#[non_exhaustive]` applied to enums, variants, and structs - `#[must_use]`, both with and without a message - `#[no_mangle]`, in both edition 2021 and 2024 (`#[unsafe(no_mangle)]`) flavors - `#[export_name]`, also in both edition 2021 and 2024 flavors Related to #137645; this is a subset of the attributes that `cargo-semver-checks` relies on and tests in its own test suite or in the test suites of its components such as `trustfall-rustdoc-adapter`. Helps with #81359 r? `@aDotInTheVoid`