[feature] Suppory unit test by providing handlers for updateStatus and DeleteJob

[gaocegege]

	// TODO(ChanYiLin): these are originally for testing, but with using common library,
	// we can not replcae the function. Also need to update or remove some tests

	// tc.updateStatusHandler = tc.UpdateJobStatusInApiServer
	// set delete handler.
	// tc.deleteTFJobHandler = tc.DeleteJob

It will be better to have such handlers to replace them when running test cases.

/cc @ChanYiLin

[ChanYiLin]

Thanks for the reminder, I'll take this issue.

[ChanYiLin]

/assign @ChanYiLin