Backport #29439 by @sillyguodong
Previously, it will be treated as "re-run all jobs" when `jobIndex ==
0`. So when you click re-run button on the first job, it triggers all
the jobs actually.
Caused by #26535.
Co-authored-by: sillyguodong <33891828+sillyguodong@users.noreply.github.com>