Update exchange json tests with correct hb_pb_cat_dur

[laurb9]

Some exchange json tests define the bidVideo response component but do not actually load it, so they validate hb_pb_cat_dur values that are different from what PBS would generate. The difference is that PBS adds _30s when that duration is given in BidVideo, but the tests use _0s.

This change updates bidderBid definition so bidVideo is deserialized into the mock response as BidVideo.
It also updates the json tests with the correct value for hb_pb_cat_dur. Alternatively, we could preserve the current values and remove BidVideo from the tests that don't need it.

A solution to the same issue in adapter tests was proposed in #3835

I am not sure why BidVideo is still necessary though. Bid.Cat[0] and Bid.Dur are available to be passed back in the Bid response, so the targeting code could use them instead.

[VeronikaSolovei9]

I am not sure why BidVideo is still necessary though. Bid.Cat[0] and Bid.Dur are available to be passed back in the Bid response, so the targeting code could use them instead.

This is up to the adapter to control how to return it. Here is an example of another location usage to fill BidVideo:

prebid-server/adapters/appnexus/appnexus.go

Line 207 in ec6a45d

BidVideo: &openrtb_ext.ExtBidPrebidVideo{Duration: bidExt.Appnexus.CreativeInfo.Video.Duration},

[VeronikaSolovei9]

Looks good to me

[hhhjort]

LGTM