[Improvement][service] Use depList instead of preTasks in TaskNode, to avoid type conversion

[unigof]

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• I had searched in the issues and found no similar feature requirement.

Description

There are two kinds of attribute to keep pre node info in TaskNode:

private String preTasks;
private List<Long> depList;

And they are be assigned at the same time:

    public void setPreTasks(String preTasks) {
        this.preTasks = preTasks;
        this.depList = JSONUtils.toList(preTasks, Long.class);
    }

So, we can use depList to replace preTasks when iterater pre task node.
e.g graphHasCycle method in WorkflowDefinitionServiceImpl

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

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This issue has been closed because it has not received response for too long time. You could reopen it if you encountered similar problems in the future.