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This commit contains the Kubernetes implementation of peer relays via the new `PeerRelay` CRD. It's a mega branch consisting of the commits of other PRs gone into this work: 1. https://github.com/tailscale/tailscale/pull/20211 2. https://github.com/tailscale/tailscale/pull/20329 3. https://github.com/tailscale/tailscale/pull/20423 4. https://github.com/tailscale/tailscale/pull/20503 An instance of the `PeerRelay` CRD deploys a `StatefulSet` of containerboot instances configured to advertise themselves as peer relays using the IP addresses configured via `LoadBalancer` services on each cloud provider (with some AWS specifics as it's less automatic than its competing cloud providers). Per replica, a `LoadBalancer` type `Service` resource is provisioned and its IP address is used to configure the respective relay. This has been tested with success in AWS, GCP & Azure and provides additional modification to `Service` resources via the CRD for any other kinds of deployment environments. It also contains some work that may appear to be duplication of what already exists within `cmd/k8s-operator` so we can start building an appropriate migration path for `Connector`, `ProxyGroup` etc into respective `k8s-operator/reconciler/*` packages. Closes https://github.com/tailscale/corp/issues/34524