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/file_finder/src/file_finder.rs

@@ -884,7 +884,7 @@ impl FileFinderDelegate {
     fn lookup_absolute_path(
         &self,
         query: FileSearchQuery,
-        cx: &mut ViewContext<'_, Picker<Self>>,
+        cx: &mut ViewContext<Picker<Self>>,
     ) -> Task<()> {
         cx.spawn(|picker, mut cx| async move {
             let Some(project) = picker