Enable lints for tests only running optimized (#6664)

* enable linting optimized-only tests

* fix automatically fixable or obvious lints

* fix suspicious_open_options by removing manual options

* fix `await_holding_lock`s

* avoid failing lint due to now disabled `#[cfg(debug_assertions)]`

* reduce future sizes in tests

* fix accidently flipped assert logic

* restore holding lock for web3signer download

* Merge branch 'unstable' into lint-opt-tests

account_manager/src/validator/exit.rs

@@ -409,6 +409,6 @@ mod tests {
         )
         .unwrap();
 
-        assert_eq!(expected_pk, kp.pk.into());
+        assert_eq!(expected_pk, kp.pk);
     }
 }