Default course: Update feedback format

[swashbuck]

Subject of the issue

The default course uses the older style of _feedback configuration. This should be updated to match the newer expanded format introduced in Core 6.20.5 / FW 5.22.8.

‼️ IMPORTANT: The related PR should not be merged until the question schemas/migration scripts have been updated to reflect the new feedback format.

Old format:

adapt_framework/src/course/en/components.json

Lines 401 to 414 in d68dd7d

	"_feedback": {
	"title": "Feedback",
	"altTitle": "",
	"correct": "Correct feedback text.<br><br>That’s correct. The first large assessment to consist solely of the multiple choice question type was the Army Alpha test, used from <strong>1917</strong> to evaluate U.S. military recruits in the First World War.<br><br>Source: <a href='http://en.wikipedia.org/wiki/Multiple_choice' target='_blank'>Wikipedia</a><br><br><i>Component facts: <b>Multiple Choice Questions (or MCQs)</b> are a tried and tested method for presenting learners with a simple text-based question. Component is either single or spanned.</i>",
	"_incorrect": {
	"notFinal": "",
	"final": "Incorrect feedback text.<br><br>That’s not right. The first large assessment to consist solely of the multiple choice question type was the Army Alpha test, used from <strong>1917</strong> to evaluate U.S. military recruits in the First World War.<br><br>Source: <a href='http://en.wikipedia.org/wiki/Multiple_choice' target='_blank'>Wikipedia</a><br><br><i>Component facts: <b>Multiple Choice Questions (or MCQs)</b> are a tried and tested method for presenting learners with a simple text-based question. Component is either single or spanned.</i>"
	},
	"_partlyCorrect": {
	"notFinal": "",
	"final": ""
	}
	},
	"_pageLevelProgress": {

Newer format:
PR: adaptlearning/adapt-contrib-core#223

At _feedback._correct, _feedback._partlyCorrectNotFinal, _feedback._partlyCorrectFinal, _feedback._incorrectNotFinal, _feedback._incorrectFinal and for _items[].feedback

Use the object:

{
  "altTitle": "",
  "title": "",
  "body": "",
  "_classes": "",
  "_imageAlignment": "left",
  "_graphic": {
    "_src": "",
    "alt": "",
    "attribution": ""
  }
}