FIXING_values.yaml-image-kafka-deprecated

[stefanjay]

What changes were proposed in this pull request?

Fixing a deprecated image repository to a current one

deprecated kafka image repo and in master
https://hub.docker.com/r/confluentinc/cp-enterprise-kafka

current kafka image repo
https://hub.docker.com/r/confluentinc/cp-server

How was this patch tested?

tested via helm with argocd and AKS

[stefanjay]

I would propose to add the newest image-tag 7.0.1 aswell to the values.yaml. If agreed I would commit this to the branch.

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