Prevent Use of Default Project in CEL expressions

apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: application-prevent-default-project
  annotations:
    policies.kyverno.io/title: Prevent Use of Default Project in CEL expressions
    policies.kyverno.io/category: Argo in CEL
    policies.kyverno.io/severity: medium
    kyverno.io/kyverno-version: 1.11.0
    policies.kyverno.io/minversion: 1.11.0
    kyverno.io/kubernetes-version: 1.26-1.27
    policies.kyverno.io/subject: Application
    policies.kyverno.io/description: This policy prevents the use of the default project in an Application.
spec:
  validationFailureAction: Audit
  background: true
  rules:
    - name: default-project
      match:
        any:
          - resources:
              kinds:
                - Application
              operations:
                - CREATE
                - UPDATE
      validate:
        cel:
          expressions:
            - expression: object.spec.?project.orValue('') != 'default'
              message: The default project may not be used in an Application.