chore: Fix a few warnings (#2396)

## What ❔

Fixes a few warnings, mostly in the prover workspace.

## Why ❔

Developing with warnings in the tree increases the warning blindness.

## Checklist

<!-- Check your PR fulfills the following items. -->
<!-- For draft PRs check the boxes as you complete them. -->

- [ ] PR title corresponds to the body of PR (we generate changelog
entries from PRs).
- [ ] Tests for the changes have been added / updated.
- [ ] Documentation comments have been added / updated.
- [ ] Code has been formatted via `zk fmt` and `zk lint`.

infrastructure/zk/src/lint.ts

@@ -35,7 +35,7 @@ async function clippy() {
 
 async function proverClippy() {
     process.chdir(`${process.env.ZKSYNC_HOME}/prover`);
-    await utils.spawn('cargo clippy --tests --locked -- -D warnings -A incomplete_features');
+    await utils.spawn('cargo clippy --tests --locked -- -D warnings');
 }
 
 async function toolboxClippy() {

prover/proof_fri_compressor/src/main.rs

@@ -1,3 +1,4 @@
+#![allow(incomplete_features)] // We have to use generic const exprs.
 #![feature(generic_const_exprs)]
 
 use std::{env, time::Duration};

prover/prover_fri/src/lib.rs

@@ -1,3 +1,4 @@
+#![allow(incomplete_features)] // We have to use generic const exprs.
 #![feature(generic_const_exprs)]
 mod metrics;
 pub mod prover_job_processor;

prover/prover_fri/src/main.rs

@@ -1,3 +1,4 @@
+#![allow(incomplete_features)] // We have to use generic const exprs.
 #![feature(generic_const_exprs)]
 
 use std::{future::Future, sync::Arc, time::Duration};

prover/witness_generator/src/lib.rs

@@ -1,3 +1,4 @@
+#![allow(incomplete_features)] // We have to use generic const exprs.
 #![feature(generic_const_exprs)]
 
 pub mod basic_circuits;

prover/witness_generator/src/main.rs

@@ -1,3 +1,4 @@
+#![allow(incomplete_features)] // We have to use generic const exprs.
 #![feature(generic_const_exprs)]
 
 use std::time::{Duration, Instant};

prover/witness_vector_generator/src/lib.rs

@@ -1,3 +1,4 @@
+#![allow(incomplete_features)] // We have to use generic const exprs.
 #![feature(generic_const_exprs)]
 
 pub mod generator;

prover/witness_vector_generator/src/main.rs

@@ -1,3 +1,4 @@
+#![allow(incomplete_features)] // We have to use generic const exprs.
 #![feature(generic_const_exprs)]
 
 use std::time::Duration;