fix(provider): drop removed custom models from the model picker - #9075

Bugbot Analysis Progress (14m 52s elapsed)

✅ Gathered PR context (5s)
✅ Completed bug detection (14m 47s)
✅ Posted analysis results (1s)

Final Result: Bugbot completed review - no issues found! ✅

Request ID: serverGenReqId_94425bab-dcf4-4d58-beba-703bdd50f4bf