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/project/src/terminals.rs

@@ -514,7 +514,7 @@ impl Project {
         terminal_handle: &Entity<Terminal>,
         cx: &mut App,
     ) {
-        terminal_handle.update(cx, |terminal, _| terminal.input_bytes(command.into_bytes()));
+        terminal_handle.update(cx, |terminal, _| terminal.input(command));
     }
 
     pub fn local_terminal_handles(&self) -> &Vec<WeakEntity<terminal::Terminal>> {