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/Cargo.toml

@@ -37,6 +37,7 @@ paths.workspace = true
 project.workspace = true
 rand.workspace = true
 schemars.workspace = true
+semver.workspace = true
 serde.workspace = true
 serde_json.workspace = true
 settings.workspace = true