Teal: bid type update

[johnclc]

🔧 Type of changes

• bid adapter update

✨ What's the context?

This change updates the Teal adapter to retrieve the bid type in the first instance directly from the bid response.

🧠 Rationale behind the change

This ensures that multi format bid requests accurately categorise the returned ad format, rather than just defaulting to the format from the impression.

🧪 Test plan

Change has been tested.

🏎 Quality check

• Are your changes following our code style guidelines?
• Are there any breaking changes in your code?
• Does your test coverage exceed 90%?
• Are there any erroneous console logs, debuggers or leftover code in your changes?