No feedback on Trusty integration when things are OK

[puerco]

When minder inspects a PR with trusty it will provide no feedback when no bad dependencies are found.

We should leverage the checks API to provide visual feedback about the Trusty run and link to a full report about the newly introduced dependencies.

[evankanderson]

We probably need some sort of re-design of how PR rules work anyway. We should include the checks API as part of that redesign.

@ethomson -- not sure if this is beta quality bar or not; right now you can't really write a PR check except by extending Minder

[evankanderson]

We should consider this in combination with #5119