Fix remaining agent server integration tests (#35222)

Release Notes:

- N/A

crates/acp_thread/src/acp_thread.rs

@@ -1597,6 +1597,7 @@ mod tests {
                 name: "test",
                 connection,
                 child_status: io_task,
+                current_thread: thread_rc,
             };
 
             AcpThread::new(

crates/acp_thread/src/old_acp_support.rs

@@ -7,6 +7,7 @@ use gpui::{AppContext as _, AsyncApp, Entity, Task, WeakEntity};
 use project::Project;
 use std::{cell::RefCell, error::Error, fmt, path::Path, rc::Rc};
 use ui::App;
+use util::ResultExt as _;
 
 use crate::{AcpThread, AgentConnection};
 
@@ -46,7 +47,7 @@ impl acp_old::Client for OldAcpClientDelegate {
                         thread.push_assistant_content_block(thought.into(), true, cx)
                     }
                 })
-                .ok();
+                .log_err();
         })?;
 
         Ok(())
@@ -364,6 +365,7 @@ pub struct OldAcpAgentConnection {
     pub name: &'static str,
     pub connection: acp_old::AgentConnection,
     pub child_status: Task<Result<()>>,
+    pub current_thread: Rc<RefCell<WeakEntity<AcpThread>>>,
 }
 
 impl AgentConnection for OldAcpAgentConnection {
@@ -383,6 +385,7 @@ impl AgentConnection for OldAcpAgentConnection {
             }
             .into_any(),
         );
+        let current_thread = self.current_thread.clone();
         cx.spawn(async move |cx| {
             let result = task.await?;
             let result = acp_old::InitializeParams::response_from_any(result)?;
@@ -396,6 +399,7 @@ impl AgentConnection for OldAcpAgentConnection {
                     let session_id = acp::SessionId("acp-old-no-id".into());
                     AcpThread::new(self.clone(), project, session_id, cx)
                 });
+                current_thread.replace(thread.downgrade());
                 thread
             })
         })