Support CAS logout for OWIN

[akunzai]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 16.92308% with 54 lines in your changes are missing coverage. Please review.

Project coverage is 68.75%. Comparing base (6729f64) to head (12fe902).
Report is 5 commits behind head on main.

Files	Patch %	Lines
...uthentication.CAS.Owin/CasAuthenticationHandler.cs	12.72%	42 Missing and 6 partials ⚠️
...thentication.CAS.Owin/Events/CasRedirectContext.cs	0.00%	5 Missing ⚠️
...ation.CAS.Owin/Events/CasAuthenticationProvider.cs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #580      +/-   ##
==========================================
- Coverage   72.04%   68.75%   -3.30%     
==========================================
  Files          42       43       +1     
  Lines        1016     1072      +56     
  Branches      136      143       +7     
==========================================
+ Hits          732      737       +5     
- Misses        219      268      +49     
- Partials       65       67       +2     

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