feat: add support for native and video ad types to ConnectAd adapter …

[rtuschkany]

…with updated test suite expectations.

[github-actions]

Code coverage summary

Note:

• Prebid team doesn't anticipate tests covering code paths that might result in marshal and unmarshal errors
• Coverage summary encompasses all commits leading up to the latest one, f9b7176

connectad

Refer here for heat map coverage report

github.com/prebid/prebid-server/v4/adapters/connectad/connectad.go:23:	Builder			100.0%
github.com/prebid/prebid-server/v4/adapters/connectad/connectad.go:30:	MakeRequests		95.0%
github.com/prebid/prebid-server/v4/adapters/connectad/connectad.go:74:	MakeBids		96.0%
github.com/prebid/prebid-server/v4/adapters/connectad/connectad.go:127:	getMediaTypeForBid	75.0%
github.com/prebid/prebid-server/v4/adapters/connectad/connectad.go:146:	preprocess		92.0%
github.com/prebid/prebid-server/v4/adapters/connectad/connectad.go:190:	addImpInfo		82.4%
github.com/prebid/prebid-server/v4/adapters/connectad/connectad.go:220:	addHeaderIfNonEmpty	100.0%
github.com/prebid/prebid-server/v4/adapters/connectad/connectad.go:226:	unpackImpExt		88.9%
github.com/prebid/prebid-server/v4/adapters/connectad/connectad.go:250:	formatBannerSize	100.0%
total:									(statements)		91.7%