Implement frontchannel OIDC logout flow

[swrichards]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 28.57143% with 10 lines in your changes missing coverage. Please review.

Project coverage is 94.17%. Comparing base (4915dad) to head (1574d94).
Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/open_inwoner/accounts/views/auth_oidc.py	9.09%	10 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1500      +/-   ##
===========================================
- Coverage    94.29%   94.17%   -0.13%     
===========================================
  Files         1066     1066              
  Lines        40157    40168      +11     
===========================================
- Hits         37866    37827      -39     
- Misses        2291     2341      +50     

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