[Vertex AI] Refactor BlockReason as a struct and add new values
#610
| Job | Run time |
|---|---|
| 1m 4s | |
| 7m 5s | |
| 3m 9s | |
| 11m 50s | |
| 4m 12s | |
| 7m 0s | |
| 1m 45s | |
| 5m 42s | |
| 2m 5s | |
| 1m 44s | |
| 1m 36s | |
| 2m 5s | |
| 2m 36s | |
| 1m 49s | |
| 53m 42s |