NL: Add PV history from all regions for regional model

[AUdaltsova]

For the site pipeline, we currently only supply PV history for the site being predicted. If the live PV data quality is reliable (like NL seems to be), we can potentially get a lot of value from knowing what's been happening to the other sites in the last couple of hours.

[yuvraajnarula]

Hi @AUdaltsova
If this issue is not resolved and we can still contribute. I would like to work on this

[AUdaltsova]

Hi @yuvraajnarula, thanks so much for offering! Unfortunately, this is an internal issue and is not open to open-source contributions. Hope something else catches your eye!