copilot_chat: Cleanup after removing OAuth via LSP (#62198)

Some cleanup after moving from away from using the LSP for OAuth

Release Notes:

- N/A

crates/copilot/src/copilot.rs

@@ -833,10 +833,7 @@ impl Copilot {
                     anyhow::Ok(())
                 })
             }
-            CopilotServer::Disabled => cx.background_spawn(async {
-                clear_copilot_config_dir().await;
-                anyhow::Ok(())
-            }),
+            CopilotServer::Disabled => cx.background_spawn(async { anyhow::Ok(()) }),
             _ => Task::ready(Err(anyhow!("copilot hasn't started yet"))),
         }
     }
@@ -1357,10 +1354,6 @@ async fn clear_copilot_dir() {
     remove_matching(paths::copilot_dir(), |_| true).await
 }
 
-async fn clear_copilot_config_dir() {
-    remove_matching(copilot_chat::copilot_chat_config_dir(), |_| true).await
-}
-
 async fn get_copilot_lsp(fs: Arc<dyn Fs>, node_runtime: NodeRuntime) -> anyhow::Result<PathBuf> {
     const PACKAGE_NAME: &str = "@github/copilot-language-server";
     const SERVER_PATH: &str =