Pack QuestionnaireResponse repeatedGroup items before validation

[LZRS]

IMPORTANT: Where possible all PRs must be linked to a Github issue

Fixes #3245
Similar implementation to: google/android-fhir#1936

Engineer Checklist

• I have written Unit tests for any new feature(s) and edge cases for bug fixes
• I have added any strings visible on UI components to the strings.xml file
• I have updated the CHANGELOG.md file for any notable changes to the codebase
• I have run ./gradlew spotlessApply and ./gradlew spotlessCheck to check my code follows the project's style guide
• I have built and run the FHIRCore app to verify my change fixes the issue and/or does not break the app
• I have checked that this PR does NOT introduce breaking changes that require an update to Content and/or Configs? If it does add a sample here or a link to exactly what changes need to be made to the content.

Code Reviewer Checklist

• I have verified Unit tests have been written for any new feature(s) and edge cases
• I have verified any strings visible on UI components are in the strings.xml file
• I have verifed the CHANGELOG.md file has any notable changes to the codebase
• I have verified the solution has been implemented in a configurable and generic way for reuseable components
• I have built and run the FHIRCore app to verify the change fixes the issue and/or does not break the app

[codecov]

Codecov Report

Attention: Patch coverage is 78.94737% with 4 lines in your changes missing coverage. Please review.

Project coverage is 28.2%. Comparing base (ac82739) to head (a8bc9a1).
Report is 100 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main   #3267     +/-   ##
=========================================
- Coverage     29.6%   28.2%   -1.4%     
- Complexity     658     719     +61     
=========================================
  Files          239     265     +26     
  Lines        11204   12706   +1502     
  Branches      1948    2259    +311     
=========================================
+ Hits          3323    3595    +272     
- Misses        7447    8642   +1195     
- Partials       434     469     +35     

Flag	Coverage Δ
engine	64.9% <100.0%> (-1.3%)	⬇️
geowidget	18.3% <ø> (-28.9%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...e/util/extension/QuestionnaireResponseExtension.kt	100.0% <100.0%> (ø)
...e/quest/ui/questionnaire/QuestionnaireViewModel.kt	2.8% <0.0%> (-0.8%)	⬇️

... and 25 files with indirect coverage changes

[allan-on]

@LZRS I saw this SDK PR google/android-fhir#2564 that has changes to fix packing for nested questions.

Do we still need this PR (with your changes) in FHIRCore?