Surface events with generic Conditions differ

[jonjohnsonjr]

See comment here: #2438 (comment)

Publishing an event that just says "I updated status" isn't particularly useful, but we should be able to determine more interesting transitions via condition severity...

After #2436 lands:

(r Recorder, obj runtime.Object, before duckv1alpha1.Conditions, after duckv1alpha1.Conditions) -> error

We should be able to take a generic delta of the Conditions and surface events through the Recorder for transitions.

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/lifecycle stale

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/lifecycle rotten

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/close

[knative-prow-robot]

@knative-housekeeping-robot: Closing this issue.

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/close

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