Disable a couple tests

They're slow on CI, and `add11_yml` seems like a better integration test.

evm/tests/basic_smart_contract.rs

@@ -28,6 +28,7 @@ type C = PoseidonGoldilocksConfig;
 
 /// Test a simple token transfer to a new address.
 #[test]
+#[ignore] // Too slow to run on CI.
 fn test_basic_smart_contract() -> anyhow::Result<()> {
     init_logger();
 

evm/tests/self_balance_gas_cost.rs

@@ -26,6 +26,7 @@ type C = PoseidonGoldilocksConfig;
 
 /// The `selfBalanceGasCost` test case from https://github.com/ethereum/tests
 #[test]
+#[ignore] // Too slow to run on CI.
 fn self_balance_gas_cost() -> anyhow::Result<()> {
     init_logger();