fix(clippy): remove unused imports in benchmarks and tests

- Remove unused Arc import from agent_operations.rs

- Remove unused TerraphimAgent import from simple_agent_test.rs

- Note: test_end_to_end_offline_workflow failure is pre-existing and unrelated to this PR

Author: Terraphim CI

crates/terraphim_multi_agent/benches/agent_operations.rs

@@ -1,6 +1,5 @@
 use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion};
 use std::hint::black_box;
-use std::sync::Arc;
 use tokio::runtime::Runtime;
 
 use terraphim_multi_agent::{test_utils::create_test_agent_simple, CommandInput, CommandType};

crates/terraphim_multi_agent/tests/simple_agent_test.rs

@@ -1,6 +1,4 @@
-use terraphim_multi_agent::{
-    agent::AgentStatus, test_utils::*, CommandInput, CommandType, TerraphimAgent,
-};
+use terraphim_multi_agent::{agent::AgentStatus, test_utils::*, CommandInput, CommandType};
 
 #[tokio::test]
 async fn test_agent_creation_simple() {