Development: Fix multipart course creation in k6 tests

[sleiss]

Checklist

General

• I tested all changes and their related features with all corresponding user types on a test server.
• I chose a title conforming to the naming conventions for pull requests.

Motivation and Context

In #5574 and #5733, the endpoint to create courses was

1. Moved to a different path
2. Changed to a multipart form

These changes were not reflected within the k6 tests.
This PR adjusts the paths and changes the course creation to multi-part forms.

Steps for Testing

See that the tests pass again:

• Bamboo: https://bamboo.ase.in.tum.de/browse/ARTEMIS-SATS8
• Jenkins: https://bamboo.ase.in.tum.de/browse/ARTEMIS-SATJG20

Review Progress

Code Review

• Review 1
• Review 2

Manual Tests

• Test 1
• Test 2

[codecov-commenter]

Codecov Report

Base: 79.91% // Head: 79.91% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (724a08c) compared to base (1fd6131).
Patch has no changes to coverable lines.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #5872      +/-   ##
=============================================
- Coverage      79.91%   79.91%   -0.01%     
  Complexity     12352    12352              
=============================================
  Files           2125     2125              
  Lines          84226    84226              
  Branches       12633    12633              
=============================================
- Hits           67309    67307       -2     
- Misses          9390     9392       +2     
  Partials        7527     7527              

Flag	Coverage Δ
client	75.63% <ø> (ø)
server	84.65% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ce/scheduled/ParticipantScoreSchedulerService.java	82.11% <0.00%> (-1.33%)	⬇️

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[julian-christl]

Thank you

[b-fein]

Thanks for implementing the suggestion. Looks good!