add unscaled variance option for GSF #836

Job	Run time
Audit Dependencies 🕵️‍♂️ / oysteR scan 🦪	1m 33s
Coverage 📔 / Coverage 📔	11m 17s
Coverage 📔 / Covtracer 🐄	0s
gitleaks 💧 / gitleaks 💧	7s
gitleaks 💧 / PII Check 💳	0s
SuperLinter 🦸‍♀️ / SuperLinter 🦸‍♂️	1m 28s
SuperLinter 🦸‍♀️ / Lint R code 🧶	1m 37s
Roxygen 🅾 / Manual pages check 🏁	3m 43s
R CMD Check 🧬 / ghcr.io/insightsengineering/rstudio, version latest	21m 16s
License Check 🃏 / Check 🚩	33s
Grammar Check 🔤 / Check 📝	12s
Check URLs 🌐 / Validate Links 🔎	6s
Check URLs 🌐 / URL Checker 🔎	0s
Spell Check 🆎 / Check spelling 🔠	1m 35s
Version Check 🏁 / Emoji in NEWS.md 📰	8s
Version Check 🏁 / Version check 🏁	4s
Coverage 📔 / Publish coverage report 📰	0s
R CMD Check 🧬 / Publish JUnit HTML report 📰	0s
R CMD Check 🧬 / Upload build tar.gz	0s
	43m 39s

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