agent: Create TerminalToolCard and display shell output while it's running (#29546)

Also, don't require a worktree to run the terminal tool.

Release Notes:

- N/A

crates/terminal_view/src/terminal_element.rs

@@ -1036,7 +1036,7 @@ impl InputHandler for TerminalInputHandler {
         cx: &mut App,
     ) {
         self.terminal.update(cx, |terminal, _| {
-            terminal.input(text.into());
+            terminal.input(text);
         });
 
         self.workspace

crates/terminal_view/src/terminal_panel.rs

@@ -1133,7 +1133,7 @@ async fn wait_for_terminals_tasks(
             })
             .ok()
     });
-    let _: Vec<_> = join_all(pending_tasks).await;
+    join_all(pending_tasks).await;
 }
 
 fn add_paths_to_terminal(