[FLINK-17336][CI] Update watchdog to properly kill watched process
As part of FLINK-16411, we introduced a run_mvn bash function. A side effect of this is that the watchdog was killing the run_mvn function call, but not the child process of that function (in this case) Maven. With this change, we are killing the function and all children of that function. Reference: https://stackoverflow.com/questions/2618403/how-to-kill-all-subprocesses-of-shell
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