Replace `SubResourceWriter.Patch` with native apply

[c-pius]

Description

Replace deprecated client.Apply in SubResourceWriter with native SSA once available. E.g., replace client.Status().Patch(ctx, obj, client.Apply) with the native alternative once available.

Reasons

v0.22.0 of controller-runtime deprecated client.Apply in favor of "Native SSA Support" via client.Client.Apply. For SubResourceWriter, there is no replacement yet, see kubernetes-sigs/controller-runtime#3183

Acceptance Criteria

• client.Apply not used anymore on SubResourceWriter
• considered all projects
  • lifecycle-manager
  • template-operator
  • runtime-watcher
  • modulectl

Feature Testing

No response

Testing approach

No response

Attachments

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