Added more unit tests to UploadPresenter

[ashishkumar468]

Description (required)
Added more unit-test cases for UploadPresenter

• Verified by running the test cases on local machine

[codecov-io]

Codecov Report

Merging #3250 into master will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master   #3250      +/-   ##
=========================================
+ Coverage    6.09%   6.15%   +0.06%     
=========================================
  Files         270     270              
  Lines       11608   11608              
  Branches      906     906              
=========================================
+ Hits          707     714       +7     
+ Misses      10844   10839       -5     
+ Partials       57      55       -2

Impacted Files	Coverage Δ
...va/fr/free/nrw/commons/upload/UploadPresenter.java	74.5% <0%> (+13.72%)	⬆️

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