fix importing creates duplicate resources

[huuphat1908]

Current logic

• Always generate new id for resources when importing
• No check for existing resources

New logic

• Only generate new id for resources when importing if the resource has no id
• Add logic to check if resources have already existed

Test data

• 5946-original-config.json
• 5946-original-config-with-additional-request.json

Test evidence

• Before: https://drive.google.com/file/d/1lxiVQCxYQvzTlecmDBDAGc7BZdLh_xN_/view?usp=sharing
• After: https://drive.google.com/file/d/1VkfwnGxU3CgMJwJrwzc2rVsxz2Dj0kRx/view?usp=sharing

Related issue: #5946

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