Omit empty output object in BuildRun spec

[SaschaSchwarze0]

Changes

When a BuildRun without an output is converted to Beta, then this looks like this:

apiVersion: shipwright.io/v1beta1
kind: BuildRun
spec:
  build:
    name: build-name
  output:
    image: ""
  serviceAccount: sa-name

The empty output section is not desired, especially as it has a mandatory image field which is then rendered as an empty string.

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Release Notes

NONE

[qu1queee]

/lgtm
/approve

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