Fix(ITE-146) Refactored structure for OnDelete

[illumin04]

Refactored structure for OnDelete on the review's suggestions.

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Testing

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• Added unit tests for new functionality
• Tested end-to-end using the local server
• [If destination is already live] Tested for backward compatibility of destination. Note: New required fields are a breaking change.
• [Segmenters] Tested in the staging environment
• [Segmenters] [If applicable for this change] Tested for regression with Hadron.