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Validate when Cilium is in ENI mode that IPv4 is enabled  #11272

@christarazi

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@christarazi

Currently, ENI mode is only supported with IPv4. Many places in the code assume IPv4 when in ENI mode. This might break subtly if Cilium has IPv4 disabled. We should have some validation in place to prevent any issues.

Reference: https://docs.cilium.io/en/v1.7/gettingstarted/aws-eni/?highlight=eni%20ipv4#limitations

From: #11163 (comment)

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    area/eniImpacts ENI based IPAM.area/miscImpacts miscellaneous areas of the code not otherwise owned by another area.good-first-issueGood starting point for new developers, which requires minimal understanding of Cilium.help-wantedPlease volunteer for this by adding yourself as an assignee!integration/cloudRelated to integration with cloud environments such as AKS, EKS, GKE, etc.kind/enhancementThis would improve or streamline existing functionality.

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