Source conformance tests - CRD label

[aliok]

Problem
Spec: https://github.com/knative/eventing/blob/master/docs/spec/sources.md#source-crds

• CRDs that are to be understood as a source MUST be labeled
• CRDs SHOULD be added to the sources category
• Source CRDs SHOULD provide additional printer columns

Persona:
System Integrator, Contributors

Exit Criteria
Test required behavior, maybe report on optional capabilities.

Time Estimate (optional):
1d

[aliok]

/area sources
/area test-and-release

[devguyio]

/assign