Use new setting for control plan ee

Now this is consumed by the awx-manage register_default_execution_environments to
make the EE that is used for project updates

roles/installer/templates/execution_environments.py.j2

@@ -1,5 +1,6 @@
-DEFAULT_EXECUTION_ENVIRONMENTS = [
+GLOBAL_JOB_EXECUTION_ENVIRONMENTS = [
 {% for item in ee_images %}
     {'name': '{{ item.name }}' , 'image': '{{ item.image }}'},
 {% endfor %}
 ]
+CONTROL_PLANE_EXECUTION_ENVIRONMENT = {{ control_plane_ee_image }}