feat: Use configured DEFAULT_GRADE_DESIGNATIONS

[xitij2000]

Support was recently added to edx-platform to add customisised default grade designations, this change adds support for them to this MFE as well to bring it to partiy with the edx-platform UI

It also refactors the grading-settings page to use React Query and updates the logic used when partitioning grades by default to make it work better when there are more than 5 partitions.

backport of openedx#1227

[codecov]

Codecov Report

Attention: Patch coverage is 92.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 92.54%. Comparing base (4584d6a) to head (acbd7fa).
Report is 6 commits behind head on asu-moe/redwood-css.

Files with missing lines	Patch %	Lines
...rc/grading-settings/grading-scale/GradingScale.jsx	60.00%	4 Missing ⚠️

Additional details and impacted files

@@                   Coverage Diff                   @@
##           asu-moe/redwood-css      #62      +/-   ##
=======================================================
+ Coverage                92.44%   92.54%   +0.09%     
=======================================================
  Files                      708      706       -2     
  Lines                    12541    12515      -26     
  Branches                  2726     2728       +2     
=======================================================
- Hits                     11594    11582      -12     
+ Misses                     912      898      -14     
  Partials                    35       35              

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

[Cup0fCoffee]

👍

• I tested this: switched the branch and tested that setting DEFAULT_GRADE_DESIGNATION to more than 5 elements correctly works in UI
• I read through the code
• I made sure any change in configuration variables is reflected in the corresponding client's configuration-secure repository.