Disttask: task state can't transform from canceling to reverted.

[ywqzzy]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

func TestFrameworkCancelThenSubmitSubTask(t *testing.T) {
	defer dispatcher.ClearTaskFlowHandle()
	defer scheduler.ClearSchedulers()
	var m sync.Map
	RegisterTaskMeta(&m)
	distContext := testkit.NewDistExecutionContext(t, 3)
	require.NoError(t, failpoint.Enable("github.com/pingcap/tidb/disttask/framework/dispatcher/cancelBeforeUpdate", "1*return(true)"))
	DispatchTaskAndCheckFail("😊", t, &m)
	require.NoError(t, failpoint.Disable("github.com/pingcap/tidb/disttask/framework/dispatcher/cancelBeforeUpdate"))
	distContext.Close()
}

2. What did you expect to see? (Required)

Task failed.

3. What did you see instead (Required)

Task hang.

4. What is your TiDB version? (Required)

master.