Verify all our OpenAPI schemas are correct

[nachocano]

Problem
Until we autogenerate the schemas, we should verify that they are actually accurate with what the underlying types say, and they should be structured as well.

Persona:
Which persona is this feature for?
Developer

Exit Criteria
Well-defined schemas

Time Estimate (optional):
1-2d

Additional context (optional)
By -oyamling a CRD, I got this:

    message: '[spec.validation.openAPIV3Schema.properties[spec].properties[sink].anyOf[0].properties[uri].type:
      Forbidden: must be empty to be structural, spec.validation.openAPIV3Schema.properties[spec].properties[sink].anyOf[0].type:
      Forbidden: must be empty to be structural, spec.validation.openAPIV3Schema.properties[spec].properties[sink].anyOf[1].properties[ref].properties[apiVersion].type:
      Forbidden: must be empty to be structural, spec.validation.openAPIV3Schema.properties[spec].properties[sink].anyOf[1].properties[ref].properties[kind].type:
      Forbidden: must be empty to be structural, spec.validation.openAPIV3Schema.properties[spec].properties[sink].anyOf[1].properties[ref].properties[name].type:
      Forbidden: must be empty to be structural, spec.validation.openAPIV3Schema.properties[spec].properties[sink].anyOf[1].properties[ref].type:
      Forbidden: must be empty to be structural, spec.validation.openAPIV3Schema.properties[spec].properties[sink].anyOf[1].type:
      Forbidden: must be empty to be structural, spec.validation.openAPIV3Schema.type:
      Required value: must not be empty at the root]'
    reason: Violations
    status: "True"
    type: NonStructuralSchema

[Harwayne]

/assign

I took care of most of this via #614 and #615.