Drift detected on sylvactl reconcile annotations

Summary

The issue was observed in https://gitlab.com/sylva-projects/sylva-core/-/jobs/10772746875#L97

Drift detection of annotations should be disabled in sylva units.

   🔹 sylva-units
      🔄 [2025-07-22T15:53:26.068Z] Kustomization/rke2-capm3-virt/root-dependency-1 changed (2 additions, 0 changes, 0 removals)","type":"Warning","object":{"kind":"HelmRelease","namespace":"rke2-capm3-virt","name":"sylva-units","uid":"6af96002-778d-4bc8-8626-1ba78530aaff","apiVersion":"helm.toolkit.fluxcd.io/v2","resourceVersion":"58100"},"reason":"DriftDetected}
      🔧 Patches applied:
        - [2025-07-22T15:53:26.068Z] Kustomization/rke2-capm3-virt/root-dependency-1 ->
          [
            {
              "value": "2025-07-22T15:53:25",
              "op": "add",
              "path": "/metadata/annotations/reconcile.fluxcd.io~1requestedAt"
            },
            {
              "value": "2025-07-22T15:53:25",
              "op": "add",
              "path": "/metadata/annotations/sylvactl~1reconcileStartedAt.1.sAzi4v"
            }
          ]
❌ Unexpected drift detected in:
   🔹 sylva-units
      Action: [2025-07-22T15:53:26.068Z] Kustomization/rke2-capm3-virt/root-dependency-1 changed (2 additions, 0 changes, 0 removals)","type":"Warning","object":{"kind":"HelmRelease","namespace":"rke2-capm3-virt","name":"sylva-units","uid":"6af96002-778d-4bc8-8626-1ba78530aaff","apiVersion":"helm.toolkit.fluxcd.io/v2","resourceVersion":"58100"},"reason":"DriftDetected}

We shouldn't detect drift on annotations of resources produced by sylva-units, as they are likely to be managed by other tools like sylvactl or flux cli.