Add support for additionalDataV2 worker hash

[afritzler]

Summary

In order to support the new NewWorkerPoolHash Gardener feature gate we need to implement the additionalDataV2 in the worker hash calculation: https://github.com/ironcore-dev/gardener-extension-provider-ironcore/blob/main/pkg/controller/worker/machines.go#L199

/cc @adenitiu

[ushabelgur]

As I checked from other providers additionalDataV2 values is calculated out of WorkerConfig.
For eg.
https://github.com/gardener/gardener-extension-provider-aws/blob/6285bce8258f8ea2887bf88402232b4214be8698/pkg/controller/worker/machines.go#L402
https://github.com/gardener/gardener-extension-provider-azure/blob/33ff443a9d20029a1bec543a494acd9170b95713/pkg/controller/worker/machines.go#L535

And some providers are simply copying same data as additionalDataV1 or they passing empty slice and putting everything in one single additionlaData .
For eg.
https://github.com/gardener/gardener-extension-provider-openstack/blob/31a90d1490a244770e27d69aa6d925859060e433/pkg/controller/worker/machines.go#L281
https://github.com/gardener/gardener-extension-provider-gcp/blob/c4a3f4f942d880e13eee7dbe0757d1db22b22a0c/pkg/controller/worker/machines.go#L362

At this moment the ironcore extension does not have any worker specific provider configuration. Should we introduce this WorkerConfig in Ironcore and what fields we want to put here? (eg. https://github.com/gardener/gardener-extension-provider-gcp/blob/master/pkg/apis/gcp/types_worker.go#L16) or we just pass empty slice here ?

cc @afritzler @balpert89

[ushabelgur]

At this moment the ironcore extension does not have any worker specific provider configuration. As discussed in synch call, we wont be fixing this issue as of now.