In #5023 we are seeing a failing CI job (see [1]); after four attempted restarts, it 404's each time when trying to download OpenVino from the Intel apt mirrors. This PR temporarily removes the wasi-nn CI job from our CI configuration so that we have green CI and can merge other work. [1] https://github.com/bytecodealliance/wasmtime/actions/runs/3200861896/jobs/5228903240