ref(google-genai): Remove `set_data_normalized` for the `gen_ai.response.finish_reasons` attribute #5506

Bugbot Review

Bugbot Analysis Progress (5m 58s elapsed)

✅ Gathered PR context (3s)
✅ Completed bug detection (5m 52s)
✅ Posted analysis results (3s)

Final Result: Bugbot completed review and found 1 potential issue.

Request ID: serverGenReqId_9dd0b77c-f15f-4d8a-8938-8669e4e1bac7

Cursor Bugbot has reviewed your changes and found 1 potential issue.

^{Bugbot Autofix is OFF. To automatically fix reported issues with Cloud Agents, enable Autofix in the Cursor dashboard.}