The `-T` option (for "taint checking") was deprecated in ruby 2.7
and removed entirely in ruby 3.0. This causes the linter to fail
entirely for users of ruby 3.0.
This was reported in #3537, and then fixed in #3538 - but it seems as
though in 9fe7b1fe6a, it was accidentally
and entirely undone.
This commit is essentially identical to #3538, aside from a path change
for the tests.
Working directories are now set seperately from the commands so they
can later be swapped out when running linters over projects is
supported, and also better support filename mapping for running linters
on other machines in future.
* Added ruby mri linter
* Added to the list of supported linters
* Async and now with 4 spaces
* Vader tests for ruby
* Match style choices
* Vader test for the Ruby handler now works and passes
