Revert me: Don't require `clippy` CI stage to succeed

Created by: cmichi

I've added some dylint stuff to our CI docker image in https://github.com/paritytech/scripts/pull/382. The docker image can't be build currently though: https://gitlab.parity.io/parity/cargo-contract/-/jobs/1376793.

This is due to an ICE in the nightly version of the Rust compiler (https://github.com/rust-lang/rust/issues/93788). Since I need those dylint tools now-ish, I would like to temporarily allow the clippy stage to fail. We can revert this PR once the ICE is fixed.

Let's not go into a discussion of setting a fixed toolchain for our CI here.

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