Some workloads (OVN raft, LINSTOR controller) fail when replicas start
at different times due to image-pull stagger across nodes. Add a
DaemonSet-based pre-pull step that runs before helm install, ensuring
all nodes have the images cached so every replica starts within
milliseconds of each other.
Covers kube-ovn (confirmed OVN raft race), piraeus-server, and
linstor-csi. Comments in hack/e2e-prepull-images.sh point to the
source chart values so versions stay in sync.
Signed-off-by: Myasnikov Daniil <myasnikovdaniil2001@gmail.com>