Fix: Only show relevant child sub contentobjects (fixes #211)

[oliverfoster]

fixes #211

Fix

• Prevent all descendant sub contentobject appearing when _showAtCourseLevel: true and only show relevant contentobjects at each level

Testing

• Using vanilla course, enable course.json:_pageLevelProgress._showAtCourseLevel
• Add content object

  {
    "_id": "co-1",
    "_parentId": "course",
    "_type": "menu",
    "_classes": "",
    "_htmlClasses": "",
    "title": "Container",
    "displayTitle": "Container",
    "body": "Find out what presentation components are available within the core bundle and how you might consider using them within your courses.",
    "pageBody": "",
    "instruction": "Scroll down to see what presentation components are available as part of the v5 core bundle.",
    "_graphic": {
      "src": "course/en/images/menu-item.png",
      "alt": ""
    },
    "linkText": "View",
    "duration": "2 mins",
    "_pageLevelProgress": {
      "_isEnabled": true,
      "_showPageCompletion": false,
      "_excludeAssessments": false,
      "_isCompletionIndicatorEnabled": false
    }
  },

• Change _parentId of other content objects to "co-1"
• Switch to this branch of plp
• Compile

[cahirodoherty-learningpool]

👀

[joe-allen-89]

👍

[kirsty-hames]

Works as expected thanks

[github-actions]

🎉 This PR is included in version 7.5.1 🎉

The release is available on GitHub release

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