Fix for #7450 sigsegv error when trying to clean up the stacks with missing eks cluster

[veekaly]

Description

This PR is to fix the issue #7450 encountered when using eksctl delete cluster --force command to delete the stacks after manually deleting the eks cluster resource.

When a cluster is inoperable (clusterOperable=false), the c.ctl.Status.ClusterInfo value is nil, and therefore passing c.ctl.Status.ClusterInfo.Cluster to the NewTasksToDeleteClusterWithNodeGroups function (owned.go#L138) is causing the nil pointer exception.

I'm setting the c.ctl.Status.ClusterInfo to an empty struct so that the function signature is respected. The actual value is never used in the function anyway because of clusterOperable=false.

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the userdocs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes
• (Core team) Added labels for change area (e.g. area/nodegroup) and kind (e.g. kind/improvement)

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[github-actions]

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