[8.16] [APM] Improve performance in `dependencies` endpoints to prevent high CPU usage (#209999) #210316
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… CPU usage (elastic#209999) ## Summary After investigating a high CPU spike in the `dependencies` endpoints for large quantities of data, we identified the issue as a slow deep merge of objects. The merge operation was growing exponentially in size based on the number of objects found with the same `id`. We improved performance by excluding the stats object from unnecessary merges and instead joining it using the spread operator. The results show a significant reduction in CPU usage, preventing the event loop from being blocked and ensuring better resource availability. |Before|After| |-|-| |<img width="1728" alt="Screenshot 2025-02-06 at 12 50 41" src="https://github.com/user-attachments/assets/6cd2bd68-6f19-42e2-bc2a-ed01a9f187c0" />|<img width="1728" alt="Screenshot 2025-02-06 at 13 11 20" src="https://github.com/user-attachments/assets/3ab7d9fb-0156-4d7e-a788-95cae11131f6" />| |<img width="2559" alt="Screenshot 2025-02-06 at 14 34 24" src="https://github.com/user-attachments/assets/3950525c-f5fa-4895-ae38-7927e5497d80" />|<img width="2558" alt="Screenshot 2025-02-06 at 14 29 08" src="https://github.com/user-attachments/assets/f05b6747-077b-49ea-a4ac-8528f6e2eb8f" />| (cherry picked from commit 0c7fb00)
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