Restrict vet to subset of packages
Extract test helpers from f_option integration test

[#71182968]
Remove ENV vars from test

Did not seem to be used outside of trying to prevent some problems
with gexec and relative paths.
Move AfterEach into Context

Seems like a good idea. A really, really, really good idea
Remove single char exclusions

This is covered by a clever regex
Backfill an integration test for -d flag

[Finishes #71182968]