Move all remaining usecases to :core:domain

[shobhitagarwal1612]

Towards #3633

Migrates all survey use cases from :app to :core:domain (KMP) and abstracts network connectivity behind an interface.

Key changes:

• Domain Use Cases: Moved ActivateSurveyUseCase, MakeSurveyAvailableOfflineUseCase, ReactivateLastSurveyUseCase, and ListAvailableSurveysUseCase to :core:domain.
• Network Abstraction: Introduced NetworkManagerInterface in :core:domain and FakeNetworkManager in :core:testing, decoupling use cases and repositories from Android connectivity APIs.
• Repository Decoupling: Exposed lastActiveSurveyId and isSurveyActive() on SurveyRepositoryInterface to remove use case dependencies on Android's LocalValueStore.
• Tests: Replaced slow Robolectric use case tests with fast KMP unit tests in :core:domain:commonTest, and modernized ViewModel tests to use FakeNetworkManager.

@andreia-ferreira PTAL?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.99%. Comparing base (221cb48) to head (f804520).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3902      +/-   ##
============================================
- Coverage     69.02%   68.99%   -0.03%     
+ Complexity     1944     1943       -1     
============================================
  Files           411      412       +1     
  Lines         10966    10963       -3     
  Branches       1428     1429       +1     
============================================
- Hits           7569     7564       -5     
- Misses         2652     2654       +2     
  Partials        745      745              

Files with missing lines	Coverage Δ
...undplatform/android/repository/SurveyRepository.kt	80.00% <100.00%> (-2.06%)	⬇️
...orm/android/repository/TermsOfServiceRepository.kt	100.00% <100.00%> (ø)
...roundplatform/android/repository/UserRepository.kt	83.05% <100.00%> (ø)
...rg/groundplatform/android/system/NetworkManager.kt	50.00% <100.00%> (-4.55%)	⬇️
...rg/groundplatform/android/ui/main/MainViewModel.kt	65.57% <ø> (ø)
...lineareas/selector/OfflineAreaSelectorViewModel.kt	88.42% <100.00%> (ø)
...roundplatform/android/ui/signin/SignInViewModel.kt	100.00% <ø> (ø)
...droid/ui/surveyselector/SurveySelectorViewModel.kt	79.34% <ø> (ø)
...dplatform/domain/system/NetworkManagerInterface.kt	100.00% <100.00%> (ø)
...rm/domain/usecases/survey/ActivateSurveyUseCase.kt	100.00% <100.00%> (ø)
... and 3 more

... and 1 file with indirect coverage changes

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