feat: fixed height for prerequisite course dropdown list

[khudym]

Description

• made fixed height for the prerequisite course dropdown list.

Note: same height is set for the course language dropdown list.

Steps to reproduce

1. add waffle flag contentstore.new_studio_mfe.use_new_grading_page (in /admin/waffle/flag);
2. go to studio -> Settings -> Schedule & details;
3. scroll page till the end and click on Prerequisite course drop-down

BEFORE

Drop-down list goes beyond footer

AFTER

Drop-down list has the same height as Course language

Course language example

[openedx-webhooks]

Thanks for the pull request, @khudym!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.22%. Comparing base (cc41a2f) to head (ff71b6e).
Report is 636 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1154      +/-   ##
==========================================
- Coverage   92.68%   92.22%   -0.47%     
==========================================
  Files         693     1008     +315     
  Lines       12347    18514    +6167     
  Branches     2693     3958    +1265     
==========================================
+ Hits        11444    17074    +5630     
- Misses        872     1371     +499     
- Partials       31       69      +38     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[mphilbrick211]

@openedx/2u-tnl following up on this!

[KristinAoki]

@khudym is there a small change that you can make to restart the test check. It appears to be stalled.