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add support to override not ready taint to be ignored by the CA

If you scale a node pool down to zero nodes the Cluster Autoscaler won't
add new nodes because pending pods don't tolerate the cilium
agent-not-ready taint. If you're managing your own CA you can ignore
the cilium taint with a command line flag on the CA. However if you're
running on managed k8s (e.g. GKE), you may not have access to configure
the CA, and will need to use a custom taint prefix to be ignored by the
autoscaler when scaling up from zero nodes in a pool.

This commit adds config to add a prefix to the agent-not-ready taint so
it can be ignored by the cluster-autoscaler.

Fixes: #19241

Co-authored-by: Xiaoxi Huang <Xiaoxi@ascend.io>
Signed-off-by: Joseph Stevens <thejosephstevens@gmail.com>

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