[ML] Fix polynomial trend failure in forecasts#2864

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valeriy42 wants to merge 2 commits intoelastic:mainfrom

valeriy42:fix/forecasting-exponential-trend

Commits on Sep 30, 2025

[ML] Add unit test for MyForecast functionality
valeriy42
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[ML] Reset prediction error statistics and trend model on significant seasonality changes
valeriy42
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