Promote Integration/IntegrationKit kustomization patch file

[squakez]

Right now, the kamel promote is returning the entire export of Integration/IntegrationKit required to port an Integration from one namespace to another such as:

$ kamel promote test --to test -o yaml
apiVersion: camel.apache.org/v1
kind: IntegrationKit
metadata:
  creationTimestamp: null
  labels:
    camel.apache.org/created.by.kind: Integration
    camel.apache.org/created.by.name: test
    camel.apache.org/created.by.namespace: default
    camel.apache.org/created.by.version: "976076"
    camel.apache.org/kit.layout: fast-jar
    camel.apache.org/kit.priority: "1000"
    camel.apache.org/kit.type: external
    camel.apache.org/runtime.provider: quarkus
    camel.apache.org/runtime.version: 3.8.1
  name: kit-cos8u5qmns6c73bp7ig0
  namespace: test
spec:
  dependencies:
  - camel:core
  - camel:timer
  - mvn:org.apache.camel.k:camel-k-runtime
  - mvn:org.apache.camel.quarkus:camel-quarkus-yaml-dsl
  image: 10.100.107.57/default/camel-k-kit-cos8u5qmns6c73bp7ig0@sha256:74b334ae0bad16f3f0b99c66311e87814c4881df4d2c2312f4f314638fb332d5
  traits: {}
status: {}
---
apiVersion: camel.apache.org/v1
kind: Integration
metadata:
  creationTimestamp: null
  name: test
  namespace: test
spec:
  flows:
  - from:
      parameters:
        period: "1000"
      steps:
      - setBody:
          simple: Hello Camel from ${routeId}
      - log: ${body}
      uri: timer:yaml
  integrationKit:
    kind: IntegrationKit
    name: kit-cos8u5qmns6c73bp7ig0
    namespace: test
  traits: {}
status: {}

We may introduce a further option (ie --patch) which would lead to the generation of a Kustomize based patch file just containing the differences between the original Integration and the patched one. This would turn very useful in the context of a gitops (as described in https://camel.apache.org/blog/2023/07/camel-k-gitops/).