Make sections/subsections/units selectable in course outline

[ChrisChV]

Description

• Make section, subsection and unit cards selectable in course otuline.
• Which user roles will this change impact? "Course Author".

Supporting information

• Github issue: Course Outline: Make sections/subsections/units selectable #2665
• Internal ticket: https://tasks.opencraft.com/browse/FAL-4292

Testing instructions

• Go to the course outline of a course
• Create this structure Section > Subsection > Units.
• Click in the white part of the border of the Section card. Verify the selection.
• Click in the white part of the border of the Subsection card. Verify the selection.
• Click in the white part of the border of the Unit card. Verify the selection.

Other information

N/A

Best Practices Checklist

We're trying to move away from some deprecated patterns in this codebase. Please
check if your PR meets these recommendations before asking for a review:

• Any new files are using TypeScript (.ts, .tsx).
• Avoid propTypes and defaultProps in any new or modified code.
• Tests should use the helpers in src/testUtils.tsx (specifically initializeMocks)
• Do not add new fields to the Redux state/store. Use React Context to share state among multiple components.
• Use React Query to load data from REST APIs. See any apiHooks.ts in this repo for examples.
• All new i18n messages in messages.ts files have a description for translators to use.
• Avoid using ../ in import paths. To import from parent folders, use @src, e.g. import { initializeMocks } from '@src/testUtils'; instead of from '../../../../testUtils'

[openedx-webhooks]

Thanks for the pull request, @ChrisChV!

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.87%. Comparing base (b76b003) to head (359007b).
⚠️ Report is 11 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2732      +/-   ##
==========================================
+ Coverage   94.86%   94.87%   +0.01%     
==========================================
  Files        1231     1236       +5     
  Lines       27922    27989      +67     
  Branches     6332     6365      +33     
==========================================
+ Hits        26487    26554      +67     
  Misses       1364     1364              
  Partials       71       71              

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