Fix chained conditional task logic

[anandwana001]

Fixes #3248 #3293 #3294

Conditional tasks were not updating correctly when their dependencies were part of a chain. Specifically, if Task C depended on Task B, and Task B depended on Task A:

User selects value in A -> B becomes visible.
User selects value in B -> C becomes visible.
User changes A -> B becomes hidden.
Issue: Task C remained visible because it was still evaluating its condition against Task B's stale data, ignoring the fact that Task B was now hidden/invalid.

Updated TaskSequenceHandler.generateValidTasksList() to iteratively build the list of valid tasks.

When evaluating if a task is valid, the system now only considers data from tasks that have already been determined to be valid in the current sequence.
This ensures that hidden tasks are treated as having no data, correctly propagating the "hidden" state down the dependency chain.

Verified with a local reproduction test case (TaskSequenceHandlerReproTest) simulating the A->B->C dependency chain.

@rfontanarosa @shobhitagarwal1612 PTAL?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.99%. Comparing base (d36f894) to head (dc10d40).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3383      +/-   ##
============================================
+ Coverage     68.96%   68.99%   +0.02%     
- Complexity     1568     1570       +2     
============================================
  Files           311      311              
  Lines          8427     8434       +7     
  Branches        932      934       +2     
============================================
+ Hits           5812     5819       +7     
  Misses         2044     2044              
  Partials        571      571              

Files with missing lines	Coverage Δ
...m/android/ui/datacollection/TaskSequenceHandler.kt	100.00% <100.00%> (ø)

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[anandwana001]

Hi @rfontanarosa If you could help us here in testing this with the exact bug you were facing, it will be quicky.