Add in links to Groovy-triggered jobs

[Cervator]

There is a fairly simple way to decorate the Jenkins job log with an active link to a just-triggered job.

ProvisionBuilder gets the link for free as it uses the normal routine of triggering builds as a post-build action. RetireBuilders for instance doesn't, as it pulls up DestroyDropletAgent via Groovy method. There may be a different way to instead trigger jobs normally but with a condition in place.

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