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/session/running/console.rs

@@ -105,6 +105,10 @@ impl Console {
         }
     }
 
+    pub(crate) fn show_indicator(&self, cx: &App) -> bool {
+        self.session.read(cx).has_new_output(self.last_token)
+    }
+
     pub fn add_messages<'a>(
         &mut self,
         events: impl Iterator<Item = &'a OutputEvent>,