Add general default for `na_str` #2810

Job	Run time
Version Bump 🤜🤛	0s
Audit Dependencies 🕵️‍♂️ / oysteR scan 🦪	1m 33s
Check URLs 🌐 / Validate Links 🔎	4s
Coverage 📔 / Coverage 📔	6m 33s
gitleaks 💧 / gitleaks 💧	3s
Coverage 📔 / Covtracer 🐄	0s
License Check 🃏 / Check 🚩	34s
gitleaks 💧 / PII Check 💳	0s
Grammar Check 🔤 / Check 📝	24s
SuperLinter 🦸‍♀️ / SuperLinter 🦸‍♂️	1m 56s
SuperLinter 🦸‍♀️ / Lint R code 🧶	2m 16s
Roxygen 🅾 / Manual pages check 🏁	2m 19s
R CMD Check 🧬 / ghcr.io/insightsengineering/rstudio, version latest	8m 26s
Spell Check 🆎 / Check spelling 🔠	1m 39s
Version Check 🏁 / Version check 🏁	2s
Style Check 👗 / Check code style 🔠	2m 46s
Version Check 🏁 / Emoji in NEWS.md 📰	9s
Coverage 📔 / Publish coverage report 📰	0s
R CMD Check 🧬 / Publish JUnit HTML report 📰	0s
R CMD Check 🧬 / Upload build tar.gz	0s
	28m 44s

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