Reconciliation of sylva-units timing-out because helm controller is OOM killed

We've recently observed many failures in the early stage of update-management-cluster Job.

Example in #11297714221

🎯 Trigger reconciliation of units
trigger reconciliation of sylva-units HelmRelease...
  helmrelease.helm.toolkit.fluxcd.io/sylva-units annotated
2025/09/09 21:01:11.210351 HelmRepository/sylva-units                         Static object - Ready
2025/09/09 21:01:11.210377 HelmChart/sylva-system-sylva-units                 Suspended
2025/09/09 21:01:11.210357 Resuming HelmChart/sylva-system/sylva-system-sylva-units
...
Timed-out waiting for the following resources to be ready:
    * HelmRelease/sylva-units: Progressing - Running 'upgrade' action with timeout of 5m0s
2025/09/09 21:04:11.056127 Command timeout exceeded