ci: add retry: 2 to the .testrunner definition so everything inherits it
#14762
| Job | Run time |
|---|---|
| 4m 7s | |
| 4m 8s | |
| 7m 16s | |
| 8m 26s | |
| 3m 17s | |
| 3m 37s | |
| 30m 51s |