python3Packages.setuptools-rust: fix cross build for all `setuptools-rust` based packages

Prior to this change all python packages using `setuptools-rust` were broken when cross compiled as they built binaries for the build platform instead of for the host platform.

The setuptoolsRustBuildHook hook would have to be included as a native build input instead of the `setuptools-rust` package, but practically wasn't used anywhere.

This change makes it so that `setuptoolsRustBuildHook` becomes unnecessary, and instead `setuptools-rust` propagates a setup-hook directly setting up the build environment, similar to how cmake does it when included via nativeBuildInputs.

This change fixes cross on all packages using `setuptools-rust` as a build-system.

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