Migrate data collection fragment to compose and improve UDF

[shobhitagarwal1612]

Towards #3709

This PR contains a series of refactorings and improvements to the Data Collection flow, moving it toward a more pure Compose architecture and better Unidirectional Data Flow (UDF) practices.

Key Changes:

• Converted the xml layout to compose except for the view pager which will be taken up separately.
• Replaced remaining instances of mutableState with StateFlow
• Replaced legacy window insets with compose APIs.
• Removed obsolete TaskUpdated state.

Screen_recording_20260501_164001.webm

@andreia-ferreira PTAL?

[codecov]

Codecov Report

❌ Patch coverage is 64.28571% with 65 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.96%. Comparing base (64bbc38) to head (7f320f8).

Files with missing lines	Patch %	Lines
.../ui/datacollection/DataCollectionScreenPreviews.kt	0.00%	42 Missing ⚠️
.../android/ui/datacollection/DataCollectionScreen.kt	89.53%	0 Missing and 9 partials ⚠️
...droid/ui/datacollection/DataCollectionViewModel.kt	73.07%	6 Missing and 1 partial ⚠️
...droid/ui/datacollection/DataCollectionViewPager.kt	71.42%	0 Missing and 4 partials ⚠️
...datacollection/DataSubmissionConfirmationScreen.kt	60.00%	0 Missing and 2 partials ⚠️
...ndroid/ui/datacollection/DataCollectionFragment.kt	87.50%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3717      +/-   ##
============================================
- Coverage     68.03%   67.96%   -0.07%     
+ Complexity     1582     1573       -9     
============================================
  Files           362      365       +3     
  Lines          9282     9375      +93     
  Branches       1198     1215      +17     
============================================
+ Hits           6315     6372      +57     
- Misses         2312     2336      +24     
- Partials        655      667      +12     

Files with missing lines	Coverage Δ
...android/ui/datacollection/DataCollectionUiState.kt	70.37% <ø> (+38.22%)	⬆️
...datacollection/tasks/DataCollectionTaskFragment.kt	57.77% <100.00%> (ø)
...org/groundplatform/android/ui/main/MainActivity.kt	36.90% <ø> (-1.47%)	⬇️
...rg/groundplatform/android/ui/main/MainViewModel.kt	58.33% <ø> (-0.69%)	⬇️
...ndroid/ui/datacollection/DataCollectionFragment.kt	96.00% <87.50%> (+17.17%)	⬆️
...datacollection/DataSubmissionConfirmationScreen.kt	92.68% <60.00%> (-1.15%)	⬇️
...droid/ui/datacollection/DataCollectionViewPager.kt	71.42% <71.42%> (ø)
...droid/ui/datacollection/DataCollectionViewModel.kt	77.32% <73.07%> (-0.36%)	⬇️
.../android/ui/datacollection/DataCollectionScreen.kt	89.53% <89.53%> (ø)
.../ui/datacollection/DataCollectionScreenPreviews.kt	0.00% <0.00%> (ø)

... and 3 files with indirect coverage changes

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