l1: remove out of scope assertion in test (#7787)

* l1: use `AnvilBaseLayer` in integration test

* l1: remove out of scope assertion in test

No need to test this, it's testing Anvil, also isn't relevant to this
test.

---------

Co-authored-by: Gilad Chase <gilad@starkware.com>

Author: giladchase

crates/papyrus_base_layer/src/base_layer_test.rs

@@ -128,18 +128,6 @@ async fn events_from_other_contract() {
     let _anvil = anvil_instance_from_config(&this_config);
     let this_contract = EthereumBaseLayerContract::new(this_config.clone());
 
-    // Test: get_proved_block_at_unknown_block_number.
-    // TODO(Arni): turn this into a unit test, with its own anvil instance.
-    assert!(
-        this_contract
-            .get_proved_block_at(123)
-            .await
-            .unwrap_err()
-            // This error is nested way too deep inside `alloy`.
-            .to_string()
-            .contains("BlockOutOfRangeError")
-    );
-
     // Test: Get events from L1 contract and other instances of this L1 contract.
     // Setup.