fix: Keep value_as_concept_id in the summary stats table

[milanmlft]

• Fixes currently failing tests due to an out-of-date snapshot
• Gets rid of warnings due to duplicate rows in the summary_stats table in the test and dev data

The duplicate rows in this case were due to some of the value_as_concept_id values not having a match in the concepts table of the test database, resulting in NA values for the value_as_string column. Which in turn leads to duplicate rows as the two rows now both have NA as value_as_string even though the original value_as_concept_id was different. Keeping the column in seems sensible and gets rid of the warnings in the tests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.70%. Comparing base (24b0f51) to head (ab077b7).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #122      +/-   ##
==========================================
- Coverage   94.36%   93.70%   -0.66%     
==========================================
  Files          23       23              
  Lines         763      763              
==========================================
- Hits          720      715       -5     
- Misses         43       48       +5     

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