roxygen_test should gather all failures and report them as a block

[MichaelChirico]

In #2930, we're observing that the CI is not failing in the friendlist way -- because the GHA errors on the first man-roxygen2 inconsistency it finds, we have to find such issues iteratively instead of fixing them in a batch.

lintr/.dev/roxygen_test.R

Line 46 in 33efecf

stop("Failed in LOCALE=", LOCALE, ".", call. = FALSE)

Ideally we can refactor this GHA so that check_roxygenize_idempotent returns a data structure instead of just erroring, then at the end of the script report all the issues at once.