Use a uniform way to get the local path of the binaries (#10211)

Signed-off-by: bo.jiang <bo.jiang@daocloud.io>

roles/kubernetes/control-plane/tasks/main.yml

@@ -29,7 +29,7 @@
 
 - name: Install | Copy kubectl binary from download dir
   copy:
-    src: "{{ local_release_dir }}/kubectl-{{ kube_version }}-{{ image_arch }}"
+    src: "{{ downloads.kubectl.dest }}"
     dest: "{{ bin_dir }}/kubectl"
     mode: 0755
     remote_src: true