elastic / elastic/ml-cpp

[ML] Forecasting trend is unexpected given data

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:ml >bug
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Description

We observed that forecasting can exhibit unexpected and unintuitive trends given data with interruptions:
![Image](https://github.com/user-attachments/assets/524fa8af-2c43-4137-bd54-1179ca2111d0)
or temporary decrease:
![Image](https://github.com/user-attachments/assets/e54dd05a-a49b-4acf-8402-17ba560f0a77)

I was able to reproduce the behavior using synthetic data:
![Image](https://github.com/user-attachments/assets/4e3b0115-2670-448b-83d8-0c3c8f6bcff4)

May be related to https://github.com/elastic/ml-cpp/issues/513

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