[Bug][server] when an exception occurs in the taskExecuteThread, task cannot stop immediately

[xxjingcd]

Describe the bug

When an exception occurs in the taskExecuteThread, task will be called the cancelApplication() method to stop the task immediately。Howerver，the task whose cancelApplication() method base on the AbstractCommandExecutor.cancelApplication() cannot be killed immediately,because AbstractCommandExecutor.cancelApplication() would not call hardKill() method when soft kill process fail;

To Reproduce

Expected behavior
In order to make the error task stop immediately ，It should call the hardKill() method when soft kill process fails；

Screenshots

Which version of Dolphin Scheduler:
-[dev]

Additional context
It is a very simple Bug, the softKill() method returns the opposite state, so just modify the return value can fix this bug. I will fix this Bug.

Requirement or improvement

[xxjingcd]

the PR： #5133

[CalvinKirs]

close by #5133