Update dependencies (big jump of controller-runtime) and Golang to 1.18

[yorugac]

This PR includes:

1. Update of Golang 1.17 → 1.18
2. Update of main Golang dependencies, including k6 and Kubernetes ones. This is a major jump for quite a few packages since we didn't manage to update properly in a while.
   • Among them is the long overdue update of controller-runtime. If I understood the magic in ⚠ leaderelection: use 'leases' as default resource lock object kubernetes-sigs/controller-runtime#1773 correctly, we need to make the next release with explicit configmapsleases set as is done in this PR. Then at some point in the future™, we can remove that setting to have leases by default.
   • Another noticeable change was around types refactoring, back from v0.7.0 🙈
   • Other code changes are relatively minor, mostly related to the tests and variable names.