Disable JWKS verification if not supported by client library

[michael-doubez]

OAuth backend is based on Google specs and some JWKS features are not supported. In this case, a warning is issued and signature verification is disabled.

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1. Make sure you are opening from a **topic/feature/bugfix branch** (right side) and not your main branch!

   Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
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2. Ensure that the pull request title represents the desired changelog entry

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3. Please describe what you did

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4. Link to relevant issues in GitHub or Jira

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5. Link to relevant pull requests, esp. upstream and downstream changes

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6. Ensure you have provided tests - that demonstrates feature works or fixes the issue

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[codecov]

Codecov Report

Attention: Patch coverage is 86.95652% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 73.35%. Comparing base (9442607) to head (e327bf2).
Report is 4 commits behind head on master.

Files	Patch %	Lines
...jenkinsci/plugins/oic/OicJsonWebTokenVerifier.java	85.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #308      +/-   ##
============================================
+ Coverage     73.27%   73.35%   +0.07%     
- Complexity      209      211       +2     
============================================
  Files            10       10              
  Lines           872      882      +10     
  Branches        123      124       +1     
============================================
+ Hits            639      647       +8     
- Misses          170      172       +2     
  Partials         63       63              

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