Windows: Enable clippy deny warnings (#9920)

~Waiting #9918~

Release Notes:

- N/A

crates/gpui/src/platform/test.rs

@@ -7,6 +7,4 @@ mod window;
 pub(crate) use dispatcher::*;
 pub(crate) use display::*;
 pub(crate) use platform::*;
-#[cfg(target_os = "windows")]
-pub(crate) use text_system::*;
 pub(crate) use window::*;