Adding compatibility for API supporting HPA

[johnugeorge]

LabelSelector field is restored to provide compatibility with the current API. Instead, Selector field will be used for HPA feature

Related: #197 https://github.com/kubeflow/training-operator/issues/1725

[johnugeorge]

@tenzen-y Once this is merged, we can create a new release in kubeflow/common Ref: https://github.com/kubeflow/training-operator/pull/1724/files#r1080943248

[tenzen-y]

@johnugeorge Can you rerun hack/update-codegen.sh?

@@ -231,7 +231,7 @@ func schema_pkg_apis_common_v1_ReplicaSt
                    },
                    "selector": {
                        SchemaProps: spec.SchemaProps{
-                           Description: "A Selector is a label query over a set of resources. The result of matchLabels and matchExpressions are ANDed. An empty Selector matches all objects. A null Selector matches no objects.",
+                           Description: "A label selector is a label query over a set of resources. The result of matchLabels and matchExpressions are ANDed. An empty label selector matches all objects. A null label selector matches no objects.",
                            Type:        []string{"string"},
                            Format:      "",
                        },
./hack/../pkg is out of date. Please run hack/update-codegen.sh

[tenzen-y]

/lgtm cancel

[tenzen-y]

/lgtm

[terrytangyuan]

/lgtm /approve

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