feat: disallow edits to units in courses that are sourced from a library [FC-0083]

[rpenido]

Description

This PR disallows edits to units in courses (including title change, children change) that are sourced from a library.

Supporting information

• Implements Disallow edits to units in courses that are sourced from a library frontend-app-authoring#1712
• Depends on Support for syncing units from libraries to courses #36553

Testing instructions

Check openedx/frontend-app-authoring#1833

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Private ref: FAL-4112

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[pomegranited]

@rpenido I fixed a couple things, but this is working as required :)

👍

• I tested this by running this code while testing openedx/frontend-app-authoring#1833
• I read through the code
• I checked for accessibility issues N/A
• Includes documentation -- code comments
• User-facing strings are extracted for translation

[pomegranited]

We already have a can_edit flag in the context, so we can use that instead of adding this parent_has_upstream flag.

Fixed with 29324b9.

[pomegranited]

Closing in favor of open-craft#774