ORTB2 Regs in the Bidder config are not merged to the global Regs object

[linux019]

This code should respect Regs object and merge to the global Regs

prebid-server/firstpartydata/first_party_data.go

Lines 439 to 444 in c48d94d

	if bidderConfig.Config != nil && bidderConfig.Config.ORTB2 != nil {
	fpdBidderData.Site = bidderConfig.Config.ORTB2.Site
	fpdBidderData.App = bidderConfig.Config.ORTB2.App
	fpdBidderData.User = bidderConfig.Config.ORTB2.User
	fpdBidderData.Device = bidderConfig.Config.ORTB2.Device
	}

https://docs.prebid.org/features/firstPartyData.html

Example of the Ext:

    "ext": {
        "prebid": {
            "auctiontimestamp": 1756986904826,
            "targeting": {
                "includewinners": false,
                "includebidderkeys": false
            },
            "adServerCurrency": "EUR",
            "bidderconfig": [
                {
                    "bidders": [
                        "improvedigital"
                    ],
                    "config": {
                        "ortb2": {
                            "regs": {
                                "coppa": 1
                            }
                        }
                    }
                }
            ],
            "channel": {
                "name": "pbjs",
                "version": "v9.50.0"
            }
        },
        "tmaxmax": 1875
    }

Does it need to validate ortb2.regs with a function similar to this one ?
What fields are allowed in the bidder config regs?

prebid-server/endpoints/openrtb2/auction.go

Line 1346 in c48d94d

func validateRegs(req *openrtb_ext.RequestWrapper, gpp gpplib.GppContainer) []error {