xiaoqisu777

[Fix-16202][api] Fix the issue of duplicate predecessor tasks

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## Purpose of the pull request close #16202 ## Brief change log ## Verify this pull request This pull request is code cleanup without any test coverage. *(or)* This pull...

[Bug] [Api] Using the TaskDefinitionController-save-single interface can lead to duplicate predecessor tasks.

1

### Search before asking - [X] I had searched in the [issues](https://github.com/apache/dolphinscheduler/issues?q=is%3Aissue) and found no similar issues. ### What happened Use this API  Adding a task adds an additional...