Backport changelogs release v0.15-beta.1 (#5805)

GitOrigin-RevId: 172547cf654ff56368d645a0e9d25d4ea6bf9b09

Author: Kylmakalle

CHANGELOG.md

@@ -4,6 +4,8 @@ Mapbox welcomes participation and contributions from everyone.
 
 ## main
 
+## 11.15.0-beta.1 - 12 August, 2025
+
 * Introduce experimental `Marker` convenience API in Swift UI. Use `Marker` to quickly add a `MapViewAnnotation` pin at the specified coordinates with custom text and color.
 
 ```swift