Change release status of Claude Opus 4.5 to GA (#58913)

Author: its-mia

data/tables/copilot/model-release-status.yml

@@ -98,7 +98,7 @@
 
 - name: 'Claude Opus 4.5'
   provider: 'Anthropic'
-  release_status: 'Public preview'
+  release_status: 'GA'
   agent_mode: true
   ask_mode: true
   edit_mode: true