Add cypress system tests

[SamuelWei]

Type (Highlight the corresponding type)

• Bugfix
• Feature
• Documentation
• Refactoring (e.g. Style updates, Test implementation, etc.)
• Other (please describe):

Checklist

• Code updated to current develop branch head
• Passes CI checks
• Is a part of an issue
• Tests added for the bugfix or newly implemented feature, describe below why if not
• Changelog is updated
• Documentation of code and features exists

Changes

• Add some basic system tests to test the whole pipline: Docker Image -> Docker Compose -> Backend <- API -> Frontend

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.84%. Comparing base (1c87660) to head (03167a5).
Report is 4 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #1166      +/-   ##
=============================================
- Coverage      95.86%   95.84%   -0.03%     
  Complexity      1295     1295              
=============================================
  Files            198      198              
  Lines           4427     4427              
=============================================
- Hits            4244     4243       -1     
- Misses           183      184       +1     

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[cypress]

Passing run #85 ↗︎

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Details:

Add cypress system tests
Project: PILOS	Commit: 03167a556e
Status: Passed	Duration: 02:48 💡
Started: Jun 21, 2024 3:00 PM	Ended: Jun 21, 2024 3:03 PM

Review all test suite changes for PR #1166 ↗︎

[Sabr1n4W]

Mostly not reviewed yet but maybe add following changes:

• Replace .should('contain', '...') with .should('have.text', '...'), .should('include.text', '...') or .should('include', '...') (last one mostly for checking url)
• Add .should('be.visible') after cy.contains('...') when checking if a specific text is shown to make sure that it is really visible

Changes will most likely also be added for the frontend tests (#1150, 8dd2dfc)