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/terminal_view/src/terminal_element.rs

@@ -867,7 +867,7 @@ impl Element for TerminalElement {
         bounds: Bounds<Pixels>,
         _: &mut Self::RequestLayoutState,
         layout: &mut Self::PrepaintState,
-        cx: &mut WindowContext<'_>,
+        cx: &mut WindowContext,
     ) {
         cx.with_content_mask(Some(ContentMask { bounds }), |cx| {
             let scroll_top = self.terminal_view.read(cx).scroll_top;