[KMP] Migrate ViewPager2 in DataCollectionFragment with a Compose HorizontalPager

[shobhitagarwal1612]

We can now eliminate AbstractTaskFragment and its 10 subclasses by replacing the ViewPager2 with a Compose-based HorizontalPager. This is feasible because the current fragments are thin wrappers that simply delegate logic to ViewModels and Compose screens.

This will be done in following phases:

1. Consolidation into a single Generic Fragment

• Eliminate all 11 fragment classes (AbstractTaskFragment + 10 subclasses) and replace them with a single DataCollectionTaskFragment.
• Update the DataCollectionViewPagerAdapter to use only this fragment.

2. Compose Host Migration

• Migrate the host DataCollectionFragment to Jetpack Compose.
• Convert the XML layout (data_collection_frag.xml) to a Compose screen.
• Wrap the existing ViewPager2 inside an AndroidView within this new Compose host.

3. Pure Compose Paging (KMP compatible)

• Remove the ViewPager2 and the FragmentStateAdapter.
• Switch to HorizontalPager in the shared UI layer.
• The map components will now be hosted directly in slots via AndroidView (on Android).