Fix faucet timeout in long faucet chain test (#2721)

* Add `forget_chain` method to wallet CLI wrapper

Allow removing chains from the wallet in tests.

* Forget irrelevant newly created chains in test

The chains only serve to increase the Faucet chain's length in a way
that simulates the Faucet from being executed for a long time, so they
can be forgotten after they have been created.

linera-service/src/cli_wrappers/wallet.rs

@@ -709,6 +709,16 @@ impl ClientWrapper {
         Ok(())
     }
 
+    /// Runs `linera wallet forget-chain CHAIN_ID`.
+    pub async fn forget_chain(&self, chain_id: ChainId) -> Result<()> {
+        let mut command = self.command().await?;
+        command
+            .args(["wallet", "forget-chain"])
+            .arg(chain_id.to_string());
+        command.spawn_and_wait_for_stdout().await?;
+        Ok(())
+    }
+
     pub async fn retry_pending_block(
         &self,
         chain_id: Option<ChainId>,

linera-service/tests/linera_net_tests.rs

@@ -2867,9 +2867,10 @@ async fn test_end_to_end_faucet_with_long_chains(config: impl LineraNetConfig) -
 
     // Use the faucet directly to initialize many chains
     for _ in 0..chain_count {
-        faucet_client
+        let (_, new_chain_id) = faucet_client
             .open_chain(faucet_chain, None, Amount::ONE)
             .await?;
+        faucet_client.forget_chain(new_chain_id).await?;
     }
 
     let amount = Amount::ONE;