task_ui: Move status indicator into tab bar of terminal panel (#10846)

I'm not a huge fan of this change (& I expect the placement to change).
The plan is to have the button in a toolbar of terminal panel, but I'm
not sure if occupying a whole line of vertical space for a single button
is worth it; I suppose we might want to put more of tasks ui inside of
that toolbar.
Release Notes:

- Removed task status indicator and added "Spawn task" action to
terminal panel context menu.

crates/workspace/src/pane.rs

@@ -193,7 +193,7 @@ pub struct Pane {
     last_focus_handle_by_item: HashMap<EntityId, WeakFocusHandle>,
     nav_history: NavHistory,
     toolbar: View<Toolbar>,
-    new_item_menu: Option<View<ContextMenu>>,
+    pub new_item_menu: Option<View<ContextMenu>>,
     split_item_menu: Option<View<ContextMenu>>,
     //     tab_context_menu: View<ContextMenu>,
     pub(crate) workspace: WeakView<Workspace>,
@@ -1747,7 +1747,7 @@ impl Pane {
             )
     }
 
-    fn render_menu_overlay(menu: &View<ContextMenu>) -> Div {
+    pub fn render_menu_overlay(menu: &View<ContextMenu>) -> Div {
         div().absolute().bottom_0().right_0().size_0().child(
             deferred(
                 anchored()