Make activateSurvey call blocking

[shobhitagarwal1612]

Fixes #3020

This PR aims to make the behavior of activate survey deterministic by making the call wait until the survey has been activated i.e. the survey gets fetched from local db and is emitted by the flow.

Without this, today the UI assumes that the survey has been activated and the screens are ready to consume it. This may lead to unwanted behavior if the next screen expects the value to be available immediately.

The function waits for 3s before throwing an error. Instead of crashing the app, we display an error toast that "something went wrong" and the user can try again.

@gino-m @sufyanAbbasi @anandwana001 PTAL?

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 5 lines in your changes missing coverage. Please review.

Project coverage is 63.60%. Comparing base (a0975c3) to head (1f01f8b).

Files with missing lines	Patch %	Lines
...round/ui/surveyselector/SurveySelectorViewModel.kt	76.92%	2 Missing and 1 partial ⚠️
...ogle/android/ground/repository/SurveyRepository.kt	75.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3021      +/-   ##
============================================
+ Coverage     63.55%   63.60%   +0.05%     
- Complexity     1267     1270       +3     
============================================
  Files           270      270              
  Lines          6560     6572      +12     
  Branches        927      930       +3     
============================================
+ Hits           4169     4180      +11     
- Misses         1786     1788       +2     
+ Partials        605      604       -1     

Files with missing lines	Coverage Δ
...in/java/com/google/android/ground/MainViewModel.kt	82.35% <100.00%> (+3.62%)	⬆️
...nd/domain/usecases/survey/ActivateSurveyUseCase.kt	100.00% <100.00%> (ø)
...ain/usecases/survey/ReactivateLastSurveyUseCase.kt	100.00% <ø> (ø)
...ogle/android/ground/repository/SurveyRepository.kt	85.71% <75.00%> (+8.29%)	⬆️
...round/ui/surveyselector/SurveySelectorViewModel.kt	86.53% <76.92%> (-7.08%)	⬇️