Refactor DataCollectionViewModel

[shobhitagarwal1612]

This PR is a pure refactor which is split from #2986 so that main logic change can be separated from refactors.

Things done:

• Instead of using currentTaskId.value as default task id in all method, pass the id from the callers
• Prevent re-creating task sequence for each value when storing values to local db.
• Cleanup unused code.

@anandwana001 PTAL?

[codecov]

Codecov Report

Attention: Patch coverage is 64.51613% with 11 lines in your changes missing coverage. Please review.

Project coverage is 63.51%. Comparing base (4a5d796) to head (3a499bf).

Files with missing lines	Patch %	Lines
...round/ui/datacollection/DataCollectionViewModel.kt	64.51%	10 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2996      +/-   ##
============================================
+ Coverage     63.49%   63.51%   +0.01%     
+ Complexity     1241     1238       -3     
============================================
  Files           267      267              
  Lines          6509     6504       -5     
  Branches        911      910       -1     
============================================
- Hits           4133     4131       -2     
+ Misses         1790     1788       -2     
+ Partials        586      585       -1     

Files with missing lines	Coverage Δ
...round/ui/datacollection/DataCollectionViewModel.kt	80.82% <64.51%> (+1.53%)	⬆️

... and 1 file with indirect coverage changes