Regional GKE clusters arent listed using current Clusters.List() implementation #108
Description
As per the title the current approach of listing cluster per zone misses regional clusters, so we should be using this API which allows listing clusters across all regions (and as a plus this should give a nice perf boost).
I have the relevant changes in my own fork: https://github.com/Alphasite/leftovers (and some cleanup to bump ginkgo and remove the vendor directory since newer go tooling doesn't play extremely well with it).