core/internal: move containerd and kubernetes to localstorage

This moves the last users of the old 'storage' library onto 'localstorage'. We move a lot of 'runtime' directories to a single `/ephemeral` root. This could be called `/run`, but that might imply FHS compliance - which we don't have, nor want to have.

We also slightly refactor Kubernetes services to be a bit nicer to spawn. But generally, this is a pure refactor, with no functional changes.

Test Plan: this should fail. part of a larger stack. D590 is the first tip of the stack that should work.

X-Origin-Diff: phab/D589
GitOrigin-RevId: d2a7c0bb52c2a7c753199221c609e03474936c22
diff --git a/core/internal/kubernetes/BUILD.bazel b/core/internal/kubernetes/BUILD.bazel
index 0a7fa22..3bcbe6a 100644
--- a/core/internal/kubernetes/BUILD.bazel
+++ b/core/internal/kubernetes/BUILD.bazel
@@ -14,20 +14,19 @@
     importpath = "git.monogon.dev/source/nexantic.git/core/internal/kubernetes",
     visibility = ["//core:__subpackages__"],
     deps = [
-        "//core/api/api:go_default_library",
         "//core/internal/common:go_default_library",
         "//core/internal/common/supervisor:go_default_library",
-        "//core/internal/consensus:go_default_library",
         "//core/internal/kubernetes/clusternet:go_default_library",
         "//core/internal/kubernetes/pki:go_default_library",
         "//core/internal/kubernetes/reconciler:go_default_library",
-        "//core/internal/storage:go_default_library",
+        "//core/internal/localstorage:go_default_library",
+        "//core/internal/localstorage/declarative:go_default_library",
         "//core/pkg/fileargs:go_default_library",
         "//core/pkg/fsquota:go_default_library",
         "//core/pkg/logbuffer:go_default_library",
+        "//core/proto/api:go_default_library",
         "@com_github_container_storage_interface_spec//lib/go/csi:go_default_library",
         "@io_bazel_rules_go//proto/wkt:wrappers_go_proto",
-        "@io_etcd_go_etcd//clientv3:go_default_library",
         "@io_k8s_api//core/v1:go_default_library",
         "@io_k8s_api//storage/v1:go_default_library",
         "@io_k8s_apimachinery//pkg/api/errors:go_default_library",