chore(core)!: remove re-exported WebviewAttributes (#13130)

Author: Legend-Master

.changes/remove-webview-attribute-reexport.md

@@ -0,0 +1,5 @@
+---
+tauri: minor:breaking
+---
+
+Removed re-exported `WebviewAttributes` from `tauri-runtime` which is exposed by accident in `tauri` and not used by any public facing APIs

crates/tauri/src/lib.rs

@@ -219,7 +219,6 @@ pub use {
   self::manager::Asset,
   self::runtime::{
     dpi::{LogicalPosition, LogicalSize, PhysicalPosition, PhysicalSize, Pixel, Position, Size},
-    webview::WebviewAttributes,
     window::{CursorIcon, DragDropEvent, WindowSizeConstraints},
     DeviceEventFilter, Rect, UserAttentionType,
   },