Redirect to login page in case token is expired instead of showing an error page

[eva-mueller-coremedia]

Instead of showing an error page, the user should be redirected to the login page.

Proposal to solve: #396

Testing done

I have tested this with 4.340.ve70636c6590e and by setting the following

(Cognito) Refresh Configuration:

Refresh token expiration: 60 minutes
Access token expiration: 10 minutes
ID token expiration: 10 minutes

After 60 minutes, I got redirected to the login page instead of getting presented an error page.

Submitter checklist

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue

[eva-mueller-coremedia]

There are a lot of test failures. I will check them

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.

Project coverage is 72.72%. Comparing base (a5a97f8) to head (89afbcf).
Report is 14 commits behind head on master.

Files with missing lines	Patch %	Lines
...va/org/jenkinsci/plugins/oic/OicSecurityRealm.java	71.42%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #395      +/-   ##
============================================
+ Coverage     71.88%   72.72%   +0.84%     
- Complexity      239      245       +6     
============================================
  Files            12       12              
  Lines          1010     1023      +13     
  Branches        145      148       +3     
============================================
+ Hits            726      744      +18     
+ Misses          206      199       -7     
- Partials         78       80       +2     

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