ORTB 2.6 upconvert, validation, usage and unit test updates

[bsardo]

No description provided.

[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, 893ca6f

openx

Refer here for heat map coverage report

github.com/prebid/prebid-server/v2/adapters/openx/openx.go:34:	MakeRequests		100.0%
github.com/prebid/prebid-server/v2/adapters/openx/openx.go:72:	makeRequest		75.0%
github.com/prebid/prebid-server/v2/adapters/openx/openx.go:118:	preprocess		85.3%
github.com/prebid/prebid-server/v2/adapters/openx/openx.go:187:	MakeBids		87.0%
github.com/prebid/prebid-server/v2/adapters/openx/openx.go:243:	getBidVideo		100.0%
github.com/prebid/prebid-server/v2/adapters/openx/openx.go:258:	getMediaTypeForImp	85.7%
github.com/prebid/prebid-server/v2/adapters/openx/openx.go:272:	Builder			100.0%
total:								(statements)		87.1%

[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, c6e46eb

openx

Refer here for heat map coverage report

github.com/prebid/prebid-server/v2/adapters/openx/openx.go:34:	MakeRequests		100.0%
github.com/prebid/prebid-server/v2/adapters/openx/openx.go:72:	makeRequest		75.0%
github.com/prebid/prebid-server/v2/adapters/openx/openx.go:118:	preprocess		85.3%
github.com/prebid/prebid-server/v2/adapters/openx/openx.go:187:	MakeBids		87.0%
github.com/prebid/prebid-server/v2/adapters/openx/openx.go:243:	getBidVideo		100.0%
github.com/prebid/prebid-server/v2/adapters/openx/openx.go:258:	getMediaTypeForImp	85.7%
github.com/prebid/prebid-server/v2/adapters/openx/openx.go:272:	Builder			100.0%
total:								(statements)		87.1%