fix!: Default ListenerClass externalTrafficPolicy to null

[sbernauer]

Description

Part of stackabletech/issues#770

As we start actually using LoadBalancers, we need to make sure they work everywhere.
@Maleware actually run into this in stackabletech/hbase-operator#698

As we are running into the kube schema bug with this, we switch to our patched version.

Definition of Done Checklist

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Author

• Changes are OpenShift compatible
• CRD changes approved
• CRD documentation for all fields, following the style guide.
• 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.
• 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

[lfrancke]

Is this something we should mention separately in the release notes?