Cleanups preparing for WindowContext refactor (#22475)

* Remove unnecessary WindowContext and ViewContext '_ lifetimes

* Removed some cases where WindowContext has a different name than `cx`.

Release Notes:

- N/A

crates/tasks_ui/src/lib.rs

@@ -105,7 +105,7 @@ fn spawn_task_or_modal(workspace: &mut Workspace, action: &Spawn, cx: &mut ViewC
 fn toggle_modal(
     workspace: &mut Workspace,
     reveal_target: Option<RevealTarget>,
-    cx: &mut ViewContext<'_, Workspace>,
+    cx: &mut ViewContext<Workspace>,
 ) -> AsyncTask<()> {
     let task_store = workspace.project().read(cx).task_store().clone();
     let workspace_handle = workspace.weak_handle();