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_ui/src/agent_diff.rs

@@ -1522,7 +1522,7 @@ impl AgentDiff {
                     self.update_reviewing_editors(workspace, window, cx);
                 }
             }
-            AcpThreadEvent::Stopped | AcpThreadEvent::Error | AcpThreadEvent::ServerExited(_) => {
+            AcpThreadEvent::Stopped | AcpThreadEvent::Error | AcpThreadEvent::LoadError(_) => {
                 self.update_reviewing_editors(workspace, window, cx);
             }
             AcpThreadEvent::TitleUpdated