`OperatorController.checkAddOperator` doesn't consider waiting queue when check whether region operator already exists
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type/enhancement
- Dominant language
- Go
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- Avg merge
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Description
## Enhancement Task
There is a situation that operators cannot be added: the region already has a higher priority or same priority operator.
The following codes implement it.

But it doesn't consider waiting queue. Some operators which will be canceled could be added.
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Assessment
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