[chore] Remove Trilead specific implementations

[Dohbedoh]

Actually move them to trilead-api, see jenkinsci/trilead-api-plugin#147.

Testing done

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5. Link to relevant pull requests, esp. upstream and downstream changes
6. Ensure you have provided tests - that demonstrates feature works or fixes the issue

[olamy]

Thanks!

[jglick]

(pending discussion of logistics)