Server-Side Apply: Status Wiping/Reset Fields

Adds and implements ResetFieldsProvder interface in order to ensure that
the fieldmanager no longer owns fields that get reset before the object
is persisted.

Co-authored-by: Kevin Wiesmueller <kwiesmul@redhat.com>
Co-authored-by: Kevin Delgado <kevindelgado@google.com>

hack/make-rules/test-cmd.sh

@@ -130,6 +130,10 @@ EOF
 # Creates a node object with name 127.0.0.1. This is required because we do not
 # run kubelet.
 #
+# An arbitrary annotation is needed to ensure field managers are saved on the
+# object. Without it, we would be creating an empty object and because status
+# and name get wiped, there were be no field managers tracking any fields.
+#
 # Exports:
 #   SUPPORTED_RESOURCES(Array of all resources supported by the apiserver).
 function create_node() {
@@ -138,7 +142,10 @@ function create_node() {
   "kind": "Node",
   "apiVersion": "v1",
   "metadata": {
-    "name": "127.0.0.1"
+    "name": "127.0.0.1",
+    "annotations": {
+      "save-managers": "true"
+    }
   },
   "status": {
     "capacity": {