test: run a nightly CI with increased fuzzing

[ClementWalter]

Why

More and more tests purely rely on fuzzing and diff testing against the reference EELS implementation. While we don't want to slow down the dev cycle, we want to make sure that we don't let cracks in the code.

What

Add a nightly job like similar to https://github.com/kkrt-labs/kakarot/blob/main/.github/workflows/cairo-zero-nightly-fuzzing.yml