Add VAST 4.1-4.3 protocols (11-16); rename creative attr 13 to UserInteractive

[rourkewhite]

What

• Add VAST 4.1–4.3 bid-response protocols (VideoProtoVAST41…VideoProtoVAST43Wrapper, values 11–16) to the §5.8 protocol enum, which previously stopped at 10.
• Rename creative attribute 13 CreativeAttributeUserInitiated → CreativeAttributeUserInteractive (value unchanged). No deprecated alias.

Why

Needed by mz-exchange content-type inference (UEX-389), which classifies video from bid.protocol and reads attr 13 for playables.

• Protocols 11–16 are defined in OpenRTB 2.6 / AdCOM v1.0 FINAL ("List: Creative Subtypes - Audio/Video"); without them VAST 4.1–4.3 bids are unrecognized by protocol. Values 9–10 remain DAAST audio (not VAST).
• AdCOM v1.0 defines attr 13 as "User Interactive (e.g., Embedded Games)" (i.e. a playable), not "user initiated" — the genuinely user-initiated attrs are 2, 4, 5, 7. The UserInitiated name has been a mislabel since it was introduced in 2017 (98881bc, "Add Creative Attributes based on OpenRTB 2.3").

Breaking change

The attribute rename is not aliased, so consumers must update on their next re-vendor:

• mz-exchange — updated as part of the re-vendor for UEX-389.
• mz-programmatic-funnel — one line (types/bidderconfig.go), on its next re-vendor.
• mz-programmatic-int-tests — dead repo, still pinned to the old org; no action.

Fork's own tests updated in this PR.

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