Use EXIT_SUCCESS in rerun test build

We have xxx_rerun test build to automatically rerun failed tests. To save resources, we should leverage TKG iteration and `EXIT_SUCCESS = true` in the rerun test build. It means, stop iterations when the current iteration is successful.

Start at the xxx_rerun test build entry point and inspect how TKG iterations are controlled. Trace the use of EXIT_SUCCESS in the rerun flow; done means iterations stop when the current iteration succeeds while failed tests still trigger reruns.

Written by the indexing model from the issue text.