NVIDIA / gpu-operator / 39509740450

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Filter DaemonSet watch updates to readiness changes

The ClusterPolicy and GPUCluster controllers watch their DaemonSets
without a predicate, so every status update enqueues a full reconcile.
During a rollout the DaemonSet controller rewrites the status once per
pod, which at fleet scale means thousands of reconciles that compute
the same result.

Add a predicate that passes an update only when the generation, labels,
annotations, or deletion state change, or when one of the status
comparisons the reconcilers read changes: desired, current, unavailable,
or misscheduled reaching or leaving zero, updated or available reaching
or leaving the desired count, or the observed generation catching up.
Pod count changes that leave all of these equal are dropped. The
not-ready requeue still polls DaemonSets that are mid-rollout.

Signed-off-by: Rajath Agasthya <ragasthya@nvidia.com>

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