fix: indexing and seasonal_periods check that endog is at least twice the size

[Lopa10ko]

This is a :fire: hotfix.

Summary

• [x] Add seasonal_periods check that endog is at least twice the size (a79d3d3)
• [x] Set proper index array size (c53af7a)

Context

related to https://github.com/aimclub/FEDOT/actions/runs/9499709347 integration workflow failure related to #1297

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Code has no PEP8 errors!