Closes #683

Description

This PR, if applied, adds default values to the cascading inherit fields. Using omitEmpty on booleans has an implicit default of omitting false values completely golang/go#13284. Since the cascading hook regards inheritLabels and inheritAnnotations undefined field as true, it was impossible to set those fields to false.

Fixed by setting the default at CRD level with kubebuilders default annotation and deleting the omitEmpty tag.

Results in all cascading scans to have the following fields by default:

  cascades:
    inheritAnnotations: true
    inheritEnv: false
    inheritLabels: true
    inheritVolumes: false
    matchExpressions:
    - key: securecodebox.io/intensive
      operator: In
      values:
      - light
      - medium
      - high
    - key: securecodebox.io/invasive
      operator: In
      values:
      - non-invasive
      - invasive

inheritLabels and inheritAnnotations true by default #334
inheritEnv and inheritVolumes false by default #538 (comment)

Checklist

• Test your changes as thoroughly as possible before you commit them. Preferably, automate your test by unit/integration tests.
• Make sure npm test runs for the whole project.
• Make codeclimate checks happy