fix: Tags missing in nodegroups added using cortex cluster configure comman...

[Roshan931]

Fixes #2392

Root cause

metadata.tags omitted from eksctl config on the add-nodegroup path

Changes

• Set eksctl metadata.tags from cluster_config["tags"] on the base ClusterConfig dict in manager/generate_eks.py, so the --add-cortex-node-groups output used by eksctl create nodegroup -f carries the cluster tags, matching the cortex cluster up path.

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