Fanny Gautier

General Issue: `CHG` and `PCHG` populated for Baseline and pre-baseline records in the templates

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### Background Information While working on the ADVS template of {admiralpeds} we were surprised to see `CHG` and `PCHG` populated at baseline and pre-baseline records in some templates such as...

Closes #2686 derive_summary_records() requires 'by_vars' in 'dataset' while not necessary

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Thank you for your Pull Request! We have developed this task checklist from the [Development Process Guide](https://pharmaverse.github.io/admiral/CONTRIBUTING.html#detailed-development-process) to help with the final steps of the process. Completing the below tasks...

Documentation: `derive_vars_dt()`

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### Please select a category the issue is focused on? Function Documentation ### Let us know where something needs a refresh or put your idea here! Could the error/warning message...