Use the ACIR parser in unit tests

[aakoshh]

Follow up for #9340 (comment)

Rewrite the unit tests in the redundant_ranges ACIR transformation to use the new ACIR parser.

The ACIR parser is currently under a #[cfg(test)]. We may want to make the ACIR parser its own crate so we can then import it into separate crates like acvm as a dev-dependency.