fix: handle double submit logout verifier gracefully

[hperl]

Related issue(s)

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security vulnerability, I
  confirm that I got the approval (please contact
  [email protected]) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (24c3be5) 75.87% compared to head (66435e1) 76.01%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3675      +/-   ##
==========================================
+ Coverage   75.87%   76.01%   +0.14%     
==========================================
  Files         134      134              
  Lines       10075    10077       +2     
==========================================
+ Hits         7644     7660      +16     
+ Misses       1914     1905       -9     
+ Partials      517      512       -5     

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