Add version detection for CC (#36502)

- Render a helpful message when the installed CC version is too old
- Show the full path for agent binaries when the version is not recent
enough (helps in cases where multiple binaries are installed in
different places)
- Add UI for the case where a server binary is not installed at all
- Refresh thread view after installing/updating server binary

Release Notes:

- N/A

crates/agent_servers/src/acp/v1.rs

@@ -14,7 +14,7 @@ use anyhow::{Context as _, Result};
 use gpui::{App, AppContext as _, AsyncApp, Entity, Task, WeakEntity};
 
 use crate::{AgentServerCommand, acp::UnsupportedVersion};
-use acp_thread::{AcpThread, AgentConnection, AuthRequired};
+use acp_thread::{AcpThread, AgentConnection, AuthRequired, LoadError};
 
 pub struct AcpConnection {
     server_name: &'static str,
@@ -87,7 +87,9 @@ impl AcpConnection {
                 for session in sessions.borrow().values() {
                     session
                         .thread
-                        .update(cx, |thread, cx| thread.emit_server_exited(status, cx))
+                        .update(cx, |thread, cx| {
+                            thread.emit_load_error(LoadError::Exited { status }, cx)
+                        })
                         .ok();
                 }