Remove the ungroup_stats() function

[edelarua]

Pull Request

Fixes #1370

I also added in a fix for the currently failing integration test.

[github-actions]

Unit Tests Summary

    1 files     84 suites   1m 16s ⏱️
  876 tests   867 ✅   9 💤 0 ❌
1 882 runs  1 185 ✅ 697 💤 0 ❌

Results for commit 66be144.

♻️ This comment has been updated with latest results.

[github-actions]

Unit Test Performance Difference

Test Suite	$Status$	Time on main	$±Time$	$±Tests$	$±Skipped$	$±Failures$	$±Errors$
analyze_vars_in_cols	💔	$2.48$	$+3.16$	$+17$	$-7$	$0$	$0$
count_occurrences	💔	$0.75$	$+1.63$	$+10$	$-8$	$0$	$0$
count_occurrences_by_grade	💔	$1.86$	$+1.02$	$+16$	$-17$	$0$	$0$
summarize_coxreg	💔	$3.91$	$+2.49$	$+13$	$-13$	$0$	$0$
summarize_num_patients	💔	$1.08$	$+1.31$	$+18$	$-16$	$0$	$0$

Additional test case details

Test Suite	$Status$	Time on main	$±Time$	Test Case
analyze_vars_in_cols	💔	$0.52$	$+1.44$	summarize_works_with_nested_analyze
summarize_coxreg	💔	$0.65$	$+1.26$	summarize_coxreg_adds_the_multivariate_Cox_regression_layer_to_rtables

Results for commit 82ace48

♻️ This comment has been updated with latest results.

[Melkiades]

Nice! Thanks for fixing integration tests too :) Good to go asis for me