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/Cargo.toml

@@ -108,7 +108,6 @@ thiserror.workspace = true
 util.workspace = true
 uuid.workspace = true
 waker-fn = "1.2.0"
-lyon = "1.0"
 
 [target.'cfg(target_os = "macos")'.dependencies]
 block = "0.1"
@@ -206,7 +205,6 @@ rand.workspace = true
 util = { workspace = true, features = ["test-support"] }
 http_client = { workspace = true, features = ["test-support"] }
 unicode-segmentation.workspace = true
-lyon = { version = "1.0", features = ["extra"] }
 
 [target.'cfg(target_os = "windows")'.build-dependencies]
 embed-resource = "3.0"