fix: Infinite authentication loop

[MoritzWeber0]

When the refresh token was expired, the backend sent the error "TOKEN_SIGNATURE_EXPIRED". The frontend did then request a new refresh token, leading to an infinite loop and a DDOS attack on our backend.

The error was accidentially added in #1569.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 80.66%. Comparing base (27e5007) to head (a1a0314).
Report is 127 commits behind head on main.

Files with missing lines	Patch %	Lines
...nd/capellacollab/core/authentication/basic_auth.py	0.00%	1 Missing ⚠️
...acollab/core/authentication/provider/oauth/flow.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1622      +/-   ##
==========================================
+ Coverage   80.64%   80.66%   +0.01%     
==========================================
  Files         185      185              
  Lines        6029     6035       +6     
  Branches      675      675              
==========================================
+ Hits         4862     4868       +6     
  Misses       1021     1021              
  Partials      146      146              

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud