Added the hasFragileUserData tag in the manifest to display the "Keep app data" checkbox in the uninstall dialog.

[MohitMaliFtechiz]

Fixes #4150

• When users attempt to uninstall the app, the "Keep app data" checkbox will appear in the uninstall dialog. By enabling it, the app's data will not be deleted upon uninstallation, allowing users to access the data again if they reinstall the app. Additionally, this is a good way to notify users that uninstalling the app can delete all app-related data, such as ZIM files.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.71%. Comparing base (b04375b) to head (64a1f3f).
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4151      +/-   ##
============================================
- Coverage     56.74%   56.71%   -0.03%     
- Complexity     1526     1529       +3     
============================================
  Files           313      313              
  Lines         13367    13367              
  Branches       1655     1655              
============================================
- Hits           7585     7581       -4     
- Misses         4651     4660       +9     
+ Partials       1131     1126       -5     

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