chore: Replace as_any functions with trait upcasting (#28221)

Closes #ISSUE

Release Notes:

- N/A

crates/terminal_view/src/terminal_scrollbar.rs

@@ -1,5 +1,4 @@
 use std::{
-    any::Any,
     cell::{Cell, RefCell},
     rc::Rc,
 };
@@ -85,8 +84,4 @@ impl ScrollableHandle for TerminalScrollHandle {
             ),
         )
     }
-
-    fn as_any(&self) -> &dyn Any {
-        self
-    }
 }