Run OTP for code coverage.

[mem48]

@layik any ideas

Tests check if they are on cran on no using

on_cran <- function() !identical(Sys.getenv("NOT_CRAN"), "true")

When code coverage is run NOT_CRAN is missing so tests that require connection to OTP are skipped.

I think I'm setting up java correctly https://github.com/ropensci/opentripplanner/blob/0c89f8e02aef8ce9373bc0cc0ce9d82b9a151ea9/.github/workflows/test-coverage.yaml#L20

So we just need to add NOT_CRAN to the REnvrion file before the code coverage is run.