refactor: xblock api upstream info and course details api

[navinkarkera]

Description

• Returns top parent key instead of boolean in upstream info api

• Adds edited_on raw time in course outline api

• Adds has_changes to course details api

• Which edX user roles will this change impact? "Developer"

Supporting information

• Used in feat: container info sidebar and add sidebar updates frontend-app-authoring#2830
• Course Outline: Section/Subsections/Unit Info Sidebar frontend-app-authoring#2638
• Course outline: Add sidebar updates frontend-app-authoring#2826

Testing instructions

See openedx/frontend-app-authoring#2830

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