Pack repeated groups recursively

[jingtang10]

IMPORTANT: All PRs must be linked to an issue (except for extremely trivial and straightforward changes).

Fixes #1899

Description
Pack repeated groups recursively

Alternative(s) considered
NA

Type
Bug fix

Screenshots (if applicable)

Checklist

• I have read and acknowledged the Code of conduct.
• I have read the Contributing page.
• I have signed the Google Individual CLA, or I am covered by my company's Corporate CLA.
• I have discussed my proposed solution with code owners in the linked issue(s) and we have agreed upon the general approach.
• I have run ./gradlew spotlessApply and ./gradlew spotlessCheck to check my code follows the style guide of this project.
• I have run ./gradlew check and ./gradlew connectedCheck to test my changes locally.
• I have built and run the demo app(s) to verify my change fixes the issue and/or does not break the demo app(s).

[jingtang10]

@nsabale7 can you please take a look at this PR - also can you pls test if this works in your case now? thanks.

[nsabale7]

@jingtang10 I tested this PR changes with questionnaire/questionnaireResponse attached in the issue and it works as expected. Looks good for me. Thanks

[MJ1998]

LGTM