debugger: Add console indicator and resolve debug configs from NewSessionModal (#28489)

The debug console will now show an indicator when it's unopened and
there's unread messages.

`NewSessionModal` attempts to resolve debug configurations before using
the config to start debugging. This allows users to use zed's task
variables in the modal prompt.

I had to invert tasks_ui dependency on debugger_ui so `NewSessionModal`
could get the correct `TaskContexts` by calling tasks_ui functions. A
consequence of this workspace has a new event `ShowAttachModal` that I'm
not a big fan of. @osiewicz if you have time could you please take a
look to see if there's a way around adding the event. I'm open to pair
on it too.

Release Notes:

- N/A

crates/debugger_ui/src/debugger_ui.rs

@@ -156,7 +156,17 @@ pub fn init(cx: &mut App) {
                             });
                         }
                     },
-                );
+                )
+                .register_action(|workspace: &mut Workspace, _: &Start, window, cx| {
+                    tasks_ui::toggle_modal(
+                        workspace,
+                        None,
+                        task::TaskModal::DebugModal,
+                        window,
+                        cx,
+                    )
+                    .detach();
+                });
         })
     })
     .detach();
@@ -237,7 +247,7 @@ pub fn init(cx: &mut App) {
 
                                     state.session().update(cx, |session, cx| {
                                         session.evaluate(text, None, stack_id, None, cx);
-                                    })
+                                    });
                                 });
                             Some(())
                         });