♻️ [#1915] Use regular logout endpoint for eHerkenning logout

[stevenbal]

task: https://taiga.maykinmedia.nl/project/open-inwoner/task/1915

As discussed, deleting the local session is sufficient to logout of eHerkenning

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (295c967) 92.91% compared to head (f95d334) 92.90%.
Report is 3 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #903      +/-   ##
===========================================
- Coverage    92.91%   92.90%   -0.01%     
===========================================
  Files          817      817              
  Lines        28023    28009      -14     
===========================================
- Hits         26037    26023      -14     
  Misses        1986     1986              

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