feat: add K8sGPT Custom Resource name as a prefix to slack messages

[arbreezy]

Closes #

📑 Description

In order to avoid having multiple slack channels to forward messages from k8sgpt operator we add a prefix to our slack messages, so it's more transparent which k8sgpt deployment is responsible for each analysis report.
e.g naming your K8sGPT CR with the name of your clusters you can track down easier where the problem is located and using a single pane of glass aka a single slack channel.

✅ 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 was requested on slack and I think it adds value. Unfortunately is not yet feasible to discern the name of your K8s cluster from within the cluster so there is no way to add it programmatically..