update `strata` var to `group_var` #3122

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Audit Dependencies 🕵️‍♂️ / oysteR scan 🦪	1m 33s
R CMD Check 🧬 / ghcr.io/insightsengineering/rstudio, version latest	1h 19m 18s
Coverage 📔 / Coverage 📔	12m 15s
Coverage 📔 / Covtracer 🐄	0s
R CMD Check (non-CRAN) 🧬 / ghcr.io/insightsengineering/rstudio, version latest	11m 31s
Check URLs 🌐 / URL Checker 🔎	46s
License Check 🃏 / Check 🚩	36s
Check URLs 🌐 / Validate Links 🔎	0s
SuperLinter 🦸‍♀️ / SuperLinter 🦸‍♂️	1m 24s
SuperLinter 🦸‍♀️ / Lint R code 🧶	1m 35s
gitleaks 💧 / gitleaks 💧	8s
gitleaks 💧 / PII Check 💳	0s
Roxygen 🅾 / Manual pages check 🏁	10m 56s
Spell Check 🆎 / Check spelling 🔠	1m 34s
Version Check 🏁 / Emoji in NEWS.md 📰	6s
Version Check 🏁 / Version check 🏁	3s
Grammar Check 🔤 / Check 📝	11s
Style Check 👗 / Check code style 🔠	2m 18s
R CMD Check (non-CRAN) 🧬 / Publish JUnit HTML report 📰	0s
R CMD Check (non-CRAN) 🧬 / Upload build tar.gz	0s
Coverage 📔 / Publish coverage report 📰	0s
R CMD Check 🧬 / Upload build tar.gz	0s
R CMD Check 🧬 / Publish JUnit HTML report 📰	0s
	2h 4m 14s

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