Do not log stacktrace if no session was found

[phavekes]

This CookiesNotSupportedException happens very often. Do not log the full stacktrace, but log information we can use instead

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.92%. Comparing base (b921b79) to head (0f2d129).

Files with missing lines	Patch %	Lines
...in/java/oidc/saml/AuthnRequestContextConsumer.java	66.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #320      +/-   ##
============================================
- Coverage     89.98%   89.92%   -0.06%     
- Complexity      665      667       +2     
============================================
  Files            86       86              
  Lines          2416     2423       +7     
  Branches        275      276       +1     
============================================
+ Hits           2174     2179       +5     
- Misses          129      130       +1     
- Partials        113      114       +1     

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