Update DEVELOPER_GUIDE.md to add gradle-check-flaky-test-detector automation information
#29848
| Job | Run time |
|---|---|
| 11m 27s | |
| 21m 28s | |
| 24m 37s | |
| 7m 42s | |
| 18m 31s | |
| 17m 31s | |
| 10m 24s | |
| 19m 6s | |
| 16m 40s | |
| 2h 27m 26s |