Updating `ard_proportion_ci()` to accept categorical variables #729

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Grammar Check 🔤 / Check 📝	14s
R CMD Check 🧬 / ghcr.io/insightsengineering/rstudio, version latest	3m 44s
R CMD Check (non-CRAN) 🧬 / Upload build tar.gz	0s
R CMD Check (non-CRAN) 🧬 / Publish JUnit HTML report 📰	0s
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R CMD Check 🧬 / Publish JUnit HTML report 📰	0s
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	20m 34s

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