chore(next-swc-napi): Remove unused(?) rlib target (#75707)
napi-rs only uses the cdylib version: https://github.com/napi-rs/napi-rs/blob/688a266f132f947b8002e892b78decd660d8a6ec/crates/napi/README.md#building
This might(?) slightly improve compile times for certain invocations of `cargo`.
