feat: Propagate externalTrafficPolicy from ListenerClass to Services

[sbernauer]

Description

New field was added in stackabletech/operator-rs#773 and stackabletech/operator-rs#789

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1. Changes are OpenShift compatible
2. CRD changes approved
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4. Helm chart can be installed and deployed operator works
5. Integration tests passed (for non trivial changes)
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[nightkr]

LGTM, modulo the op-rs release

[lfrancke]

Are there docs for this?
If not, can you please elaborate briefly what this is about?

[sbernauer]

There are no docs (other than the CRD description), this PR literally takes the field external_traffic_policy from the ListenerClass and put's it on the created Services.
Reasoning is in stackabletech/operator-rs#773, but mainly

If i use the ListenerClass external-stable on IONOS k8s the LoadBalancer svc is not reachable. I did find out it's because we set externalTrafficPolicy: Local on the svc here.
This PR simply allows users to configure that field, which is than passed to the created Service. We leave the default as-is at Local, so we don't have any breaking change.

This change is needed for external-stable to work on IONOS!