Migrated the prefIsBookmarksMigrated, prefIsRecentSearchMigrated, etc, to use Datastore instead of SharedPreferences.

[MohitMaliFtechiz]

Fixes #4521

Parent PR #4520

Continuing from #4520

• Migrated the PREF_BOOKMARKS_MIGRATED to dataStore.
• Migrated the PREF_RECENT_SEARCH_MIGRATED to dataStore.
• Migrated the PREF_NOTES_MIGRATED to dataStore.
• Migrated the PREF_HISTORY_MIGRATED to dataStore.
• Migrated the PREF_APP_DIRECTORY_TO_PUBLIC_MIGRATED to dataStore.
• Migrated the PREF_BOOK_ON_DISK_MIGRATED to dataStore.
• Added a migration test case to verify the transfer of data from SharedPreferences to DataStore.
• Removed unused methods from SharedPreferenceUtil.

[codecov]

Codecov Report

❌ Patch coverage is 55.38462% with 29 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.01%. Comparing base (664ca35) to head (c4d7e6c).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...kiwixmobile/core/utils/datastore/KiwixDataStore.kt	52.77%	11 Missing and 6 partials ⚠️
...ixmobile/migration/data/ObjectBoxToRoomMigrator.kt	0.00%	7 Missing ⚠️
...bile/migration/data/ObjectBoxToLibkiwixMigrator.kt	0.00%	5 Missing ⚠️

❌ Your patch status has failed because the patch coverage (55.38%) is below the target coverage (70.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4522      +/-   ##
============================================
- Coverage     59.04%   59.01%   -0.04%     
- Complexity     1538     1544       +6     
============================================
  Files           327      327              
  Lines         17623    17660      +37     
  Branches       2183     2183              
============================================
+ Hits          10406    10422      +16     
- Misses         5777     5790      +13     
- Partials       1440     1448       +8     

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