feat: extend BDD tests

[mishasizov-SK]

• invalid JWT kid header
• invalid signature
• invalid nonce in /credential req

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0dc0668) 85.31% compared to head (d80cd6f) 85.31%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1491   +/-   ##
=======================================
  Coverage   85.31%   85.31%           
=======================================
  Files         166      166           
  Lines       10406    10406           
=======================================
  Hits         8878     8878           
  Misses       1118     1118           
  Partials      410      410           

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