[Firebase AI] Add GenerativeModel tests using Dev API mock responses
#1298
| Job | Run time |
|---|---|
| 1m 28s | |
| 8m 18s | |
| 6m 20s | |
| 6m 33s | |
| 2m 28s | |
| 2m 24s | |
| 2m 5s | |
| 2m 51s | |
| 3m 43s | |
| 4m 23s | |
| 3m 5s | |
| 43m 38s |