fix: Certificate validation error in JWT finalizer for CA-issued certificates resolved

[dadrus]

Related issue(s)

closes #1899

Checklist

• I agree to follow this project's Code of Conduct.
• I have read, and I am following this repository's Contributing Guidelines.
• I have read the Security Policy.
• I have referenced an issue describing the bug/feature request.
• I have added tests that prove the correctness of my implementation.

Description

CA-issued certificates can now be used in jwt finalizer without the need to add any certificates to heimdall's trust store.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.75%. Comparing base (99e6285) to head (9cefb5b).
Report is 1 commits behind head on release.

Additional details and impacted files

@@             Coverage Diff             @@
##           release    #1900      +/-   ##
===========================================
+ Coverage    89.68%   89.75%   +0.06%     
===========================================
  Files          271      271              
  Lines         9154     9156       +2     
===========================================
+ Hits          8210     8218       +8     
+ Misses         700      697       -3     
+ Partials       244      241       -3     

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