Added unit-tests for PageEditClient & ThanksClient

[ashishkumar468]

Description (required)

Added the unit-tests for package actions.

Tests performed (required)

Ran the tests locally

[codecov-io]

Codecov Report

Merging #3268 into master will increase coverage by 0.19%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master   #3268      +/-   ##
=========================================
+ Coverage    6.53%   6.72%   +0.19%     
=========================================
  Files         270     270              
  Lines       11636   11636              
  Branches      908     908              
=========================================
+ Hits          760     783      +23     
+ Misses      10816   10793      -23     
  Partials       60      60

Impacted Files	Coverage Δ
...va/fr/free/nrw/commons/actions/PageEditClient.java	66.66% <0%> (+66.66%)	⬆️
...java/fr/free/nrw/commons/actions/ThanksClient.java	90% <0%> (+90%)	⬆️

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