Revert recent anti-aliasing improvements (#24289)

This reverts commit 31fa414422.
This reverts commit b9e0aae49f.

`lyon` commit revert:

![image](https://github.com/user-attachments/assets/0243f61c-0713-416d-b8db-47372e04abaa)

`MSAA` commit revert:

![image](https://github.com/user-attachments/assets/b1a4a9fe-0192-47ef-be6f-52e03c025724)

cc @huacnlee , @\as-cii had decided to revert this PR due to a selection
right corner rendering bug.
Not sure what to propose for a fix from my side

Release Notes:

- N/A

crates/gpui/src/gpui.rs

@@ -82,7 +82,6 @@ mod input;
 mod interactive;
 mod key_dispatch;
 mod keymap;
-mod path_builder;
 mod platform;
 pub mod prelude;
 mod scene;
@@ -136,7 +135,6 @@ pub use input::*;
 pub use interactive::*;
 use key_dispatch::*;
 pub use keymap::*;
-pub use path_builder::*;
 pub use platform::*;
 pub use refineable::*;
 pub use scene::*;