Unit test cases for logout, session manager and reason builder

[maskaravivek]

Adds more test cases.

[tests-checker]

Could you please add tests to make sure this change works as expected?

[ashishkumar468]

@maskaravivek I have already added the tests for ThanksClient :P, Please sync your branch with master :)

[codecov-io]

Codecov Report

Merging #3269 into master will increase coverage by 0.18%.
The diff coverage is 75%.

@@            Coverage Diff            @@
##           master   #3269      +/-   ##
=========================================
+ Coverage    6.72%   6.91%   +0.18%     
=========================================
  Files         270     270              
  Lines       11636   11635       -1     
  Branches      908     907       -1     
=========================================
+ Hits          783     805      +22     
+ Misses      10793   10770      -23     
  Partials       60      60

Impacted Files	Coverage Δ
...va/fr/free/nrw/commons/actions/PageEditClient.java	82.35% <ø> (+15.68%)	⬆️
.../java/fr/free/nrw/commons/auth/SessionManager.java	0% <0%> (ø)	⬆️
...ava/fr/free/nrw/commons/utils/ViewUtilWrapper.java	0% <0%> (ø)	⬆️
...in/java/fr/free/nrw/commons/auth/LogoutClient.java	80% <100%> (+80%)	⬆️
...java/fr/free/nrw/commons/delete/ReasonBuilder.java	69.23% <100%> (+69.23%)	⬆️

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[ashishkumar468]

LGTM :)