Fix recipe steps with polymorphic types

[sebastienros]

Fixes #15246

[MikeAlhayek]

@sebastienros I think this works. But I think we also need to do the same things with deployment. If you try to export the Admin menu using deployment, the JSON looks like this

{
  "steps": [
    {
      "name": "AdminMenu",
      "data": [
        {
          "Id": "baef6f85ad13481681cde70ada401333",
          "Name": "Admin menus",
          "Enabled": true,
          "MenuItems": [
            {
              "UniqueId": "7b293d57056a4eebb3713f07f12c65d8",
              "Enabled": true,
              "Priority": 0,
              "LinkToFirstChild": true,
              "LocalNav": false,
              "Items": [],
              "Classes": []
            },
            {
              "UniqueId": "5118cecfde834dacb26ac08980f1b5a7",
              "Enabled": true,
              "Priority": 0,
              "LinkToFirstChild": true,
              "LocalNav": false,
              "Items": [],
              "Classes": []
            },
            {
              "UniqueId": "3e590d44f8704e4588e272dd966ce291",
              "Enabled": true,
              "Priority": 0,
              "LinkToFirstChild": true,
              "LocalNav": false,
              "Items": [
                {
                  "Position": "0",
                  "Priority": 0,
                  "LinkToFirstChild": true,
                  "LocalNav": false,
                  "Items": [],
                  "Classes": []
                },
                {
                  "Position": "1",
                  "Priority": 50,
                  "LinkToFirstChild": true,
                  "LocalNav": false,
                  "Items": [
                    {
                      "Priority": 0,
                      "LinkToFirstChild": true,
                      "LocalNav": false,
                      "Items": [],
                      "Classes": []
                    }
                  ],
                  "Classes": []
                }
              ],
              "Classes": []
            }
          ]
        }
      ]
    }
  ]
}

[sebastienros]

@MikeAlhayek fixed

[MikeAlhayek]

I'll give it a try.

Since you are in STJ mind set, have a look at this issue if you have time #15322

[MikeAlhayek]

Still not working.

[MikeAlhayek]

I actually did another test. The Admin Menu seems to be working.