Dequalify WindowContext and AsyncWindowContext identifiers (#22444)

This makes a WIP automated refactoring a bit easier to write

Release Notes:

- N/A

crates/workspace/src/item.rs

@@ -1057,11 +1057,10 @@ pub mod test {
     use gpui::{
         AnyElement, AppContext, Context as _, EntityId, EventEmitter, FocusableView,
         InteractiveElement, IntoElement, Model, Render, SharedString, Task, View, ViewContext,
-        VisualContext, WeakView,
+        VisualContext, WeakView, WindowContext,
     };
     use project::{Project, ProjectEntryId, ProjectPath, WorktreeId};
     use std::{any::Any, cell::Cell, path::Path};
-    use ui::WindowContext;
 
     pub struct TestProjectItem {
         pub entry_id: Option<ProjectEntryId>,
@@ -1376,7 +1375,7 @@ pub mod test {
         fn cleanup(
             _workspace_id: WorkspaceId,
             _alive_items: Vec<ItemId>,
-            _cx: &mut ui::WindowContext,
+            _cx: &mut WindowContext,
         ) -> Task<anyhow::Result<()>> {
             Task::ready(Ok(()))
         }