fix: Propagate serviceAnnotations to created Services

[sbernauer]

Description

Reported in https://github.com/orgs/stackabletech/discussions/57

This PR actually now uses ListenerClass.spec.serviceAnnotations...

The following ListenerClass

apiVersion: listeners.stackable.tech/v1alpha1
kind: ListenerClass
metadata:
  name: lb-with-annotations
spec:
  serviceType: LoadBalancer
  serviceAnnotations:
    # networking.gke.io/load-balancer-type: Internal
    service.beta.kubernetes.io/aws-load-balancer-internal: "true"
    service.beta.kubernetes.io/aws-load-balancer-type: internal

now produces the correct annotations on the Service

Definition of Done Checklist

• Not all of these items are applicable to all PRs, the author should update this template to only leave the boxes in that are relevant
• Please make sure all these things are done and tick the boxes

# Author
- [ ] Changes are OpenShift compatible
- [ ] CRD changes approved
- [ ] CRD documentation for all fields, following the [style guide](https://docs.stackable.tech/home/nightly/contributor/docs/style-guide).
- [ ] Helm chart can be installed and deployed operator works
- [ ] Integration tests passed (for non trivial changes)
- [ ] Changes need to be "offline" compatible

# Reviewer
- [ ] Code contains useful comments
- [ ] Code contains useful logging statements
- [ ] (Integration-)Test cases added
- [ ] Documentation added or updated. Follows the [style guide](https://docs.stackable.tech/home/nightly/contributor/docs/style-guide).
- [ ] Changelog updated
- [ ] Cargo.toml only contains references to git tags (not specific commits or branches)

# Acceptance
- [ ] Feature Tracker has been updated
- [ ] Proper release label has been added
- [ ] [Roadmap](https://github.com/orgs/stackabletech/projects/25/views/1) has been updated

[lfrancke]

Could you please include a short sentence we can use for the release notes?

[sbernauer]

ListenerClass.spec.serviceAnnotations are now correctly propagated to created Service objects.