Update DEVELOPER_GUIDE.md to add gradle-check-flaky-test-detector automation information
#8832
| Job | Run time |
|---|---|
| 10m 57s | |
| 13m 10s | |
| 52m 40s | |
| 10m 42s | |
| 11m 45s | |
| 56m 56s | |
| 10m 9s | |
| 12m 34s | |
| 44m 19s | |
| 3h 43m 12s |