Add natural gas price regression pipeline#2

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Yunzhi-Chen wants to merge 14 commits intomainfrom

yc/natural_gas_update

Commits on Apr 16, 2026

Move natural gas price regression code to here
Yunzhi-Chen
committed

Commits on Apr 20, 2026

Add auto-update for historical NG data and backfill 2024
Yunzhi-Chen
committed

Commits on Apr 24, 2026

Remove old method for updating natural gas values.
wesleyjcole
committed