Yeet env_logger into the sun (#7872)

- Remove explicit `env_logger` usage from `state_processing` tests and `lcli`.
- Set up tracing correctly for `lcli` (I've checked that we can see logs after this change).
- I didn't do anything to set up logging for the `state_processing` tests, as these are rarely run manually (they never fail). We could add `test_logger` in there on an as-needed basis.

consensus/state_processing/src/per_epoch_processing/tests.rs

@@ -3,13 +3,10 @@ use crate::per_epoch_processing::process_epoch;
 use beacon_chain::test_utils::BeaconChainHarness;
 use beacon_chain::types::{EthSpec, MinimalEthSpec};
 use bls::{FixedBytesExtended, Hash256};
-use env_logger::{Builder, Env};
 use types::Slot;
 
 #[tokio::test]
 async fn runs_without_error() {
-    Builder::from_env(Env::default().default_filter_or("error")).init();
-
     let harness = BeaconChainHarness::builder(MinimalEthSpec)
         .default_spec()
         .deterministic_keypairs(8)