Support shoot.Spec.CloudProfile with CloudProfiles and NamespacedCloudProfiles besides CloudProfileName

[LucaBernstein]

What would you like to be added:

• Add support for the shoot.Spec.CloudProfile field.
  • Best would be to sort it next to shoot.Spec.CloudProfileName, until it is deprecated and removed (for better visibility).
• shoot.Spec.CloudProfileName should still be supported along until all enablement and migration steps are complete
• In a first step, shoot.Spec.CloudProfile will be filled by default from shoot.Spec.CloudProfileName (After Enable cloudProfile reference as complement to cloudProfileName gardener#10093 is merged → will be available from v1.101 on)
• shoot.Spec.CloudProfile will also be able to reference NamespacedCloudProfiles besides CloudProfiles (current default).

Why is this needed:

• Related to: ☂️ [GEP-25] Introduce NamespacedCloudProfiles gardener#9504
• shoot.Spec.CloudProfile will be added and shoot.Spec.CloudProfileName will be deprecated and removed eventually