Uploading release APK in Github release instead of standalone APK.

[MohitMaliFtechiz]

Fixes #4114

• To resolve the publishing issue on IzzyOnDroid, we are now uploading the Release APK(with org.kiwix.kiwixmobile package name) to the GitHub release, so that IzzyOnDroid can retrieve the APK and upload it to their platform easily.
• Generated dummy release APKs along with the dummy bundle to have them readily available if needed. For example, in the current scenario, we need to manually generate the release APKs and upload them to the 3.12.0 GitHub release so that IzzyOnDroid can fetch and update the application on their platform. See it is uploaded the Release APKs https://github.com/kiwix/kiwix-android/actions/runs/12063880435

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.10%. Comparing base (2cd2e15) to head (7ced396).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4115      +/-   ##
============================================
+ Coverage     58.89%   59.10%   +0.21%     
- Complexity     1569     1582      +13     
============================================
  Files           316      316              
  Lines         13431    13431              
  Branches       1706     1706              
============================================
+ Hits           7910     7939      +29     
+ Misses         4385     4361      -24     
+ Partials       1136     1131       -5     

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