feat: add backstage support

[arbreezy]

Closes #

📑 Description

PR enables backstage support and add the appropriate labels to results CR

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed

ℹ Additional Information

this request is coming from @jkleinlercher.

Hi! I am currently testing how k8sgpt results can get integrated in backstage.io ... backstage is a very popular dev-portal and I think it would be very cool to see the k8sgpt analyses for my application also in the entity page of backstage.
my current approach is to use the backstage kubernetes plugin ( https://backstage.io/docs/features/kubernetes/ ). The concept behind it is that backstage only shows K8s objects which are labeled with your backstage entity, e.g. "backstage.io/kubernetes-id: my-kubernetes-component"