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

[Lopa10ko]

This is a 🔥 hotfix.

Summary

• Add seasonal_periods check that endog is at least twice the size (a79d3d3)
• 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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[github-actions]

Code has no PEP8 errors!