[Improvement][API] When removing or modifying a workflow the system should check if there any tasks depend on it.

[calvinjiang]

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

Description

When removing or modifying a workflow the backend api doesn't check if there any tasks depend on it. If you remove a workflow, its dependent tasks can't execute properly. Likewise, if you remove a task. So the backend api needs to check.

Are you willing to submit a PR?

• [X] Yes I am willing to submit a PR!

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