Deprioritize resync operations

[alandiegosantos]

In this controller, the re-sync of the istio-ca-root configmap is not a priority compared with the events derived from namespace operations or the change in the root CA. The resync might take tenths of minutes in clusters with thousands of namespaces, slowing the provisioning of the configmap on new namespaces.

So, this MR updates the controller to use WithLowPriorityWhenUnchanged, reducing the priority of the re-sync if the configmap is unchanged. PriorityQueues are default in controller-runtime v0.23, so no other change is necessary.

[cert-manager-prow]

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[cert-manager-prow]

Hi @alandiegosantos. Thanks for your PR.

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