fix: Fix discussions and notifications sidebars visibility with big amount of units

[Lunyachek]

Description

When we have too many units in a section, the course content significantly compresses the sidebar with Discussions and Notifications. It becomes impossible to interact with them. Our proposal is to add horizontal scrolling to the unit navigation if there are too many units. To be more precise, horizontal scrolling for unit navigation is already provided, but it does not work because the sidebar with Discussions and Notifications simply compresses.

Demo

Before fix

2024-03-25.18.07.56.mov

After fix

2024-03-25.18.35.17.mov

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.23%. Comparing base (0cb369a) to head (bac7eec).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1333   +/-   ##
=======================================
  Coverage   88.23%   88.23%           
=======================================
  Files         293      293           
  Lines        4988     4988           
  Branches     1266     1266           
=======================================
  Hits         4401     4401           
  Misses        571      571           
  Partials       16       16           

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[jmakowski1123]

See comment here: openedx/platform-roadmap#348

[itsjeyd]

@Lunyachek I'm closing this PR based on this update about sidebar enhancements from product.

Feel free to reopen it and resume the conversation via openedx/platform-roadmap#348 once you've had a chance to test the sidebar enhancements in Redwood.

CC @jmakowski1123

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