Use official IDs for EU27 and RES region datasets

[michieldenhaan]

CBS now has geo IDs for RES regions:

When we first added the RES regions to the ETM these geo IDs were not yet available, so we made them up ourselves. Now that there are 'official' IDs it would be nice to use them in our datasets.

[github-actions]

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[mabijkerk]

@kndehaan can pick this up at some point. Would be good to check for fallout with @Charlottevm and @noracato. We would definitely need to write an ETEngine migration to change the geo_id for all relevant scenarios. We would also have to update the locales in ETModel.

[kndehaan]

This issue is updated to address using official IDs for:

• RES regions: based on the region IDs used by CBS (ESXX1)
• EU27 dataset: should be labelled EU27_2020 on ETLocal, in line with the label used by Eurostat. The dataset should also be renamed on ETSource to for instance EU27_2020_european_union