fix(r): Fix tests for platforms where arrow dataset and/or zip is not available

[paleolimbot]

The utils::zip() function is not all that reliable; however, we only use it to create test data anyway. This was causing release verification to fail on alpine.

While running the tests, I also noticed that one of the IPC skips that checks for Arrow dataset does so incorrectly.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.76%. Comparing base (9935713) to head (bb8a5f4).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #415 +/- ## ======================================= Coverage 88.76% 88.76% ======================================= Files 82 82 Lines 14633 14633 ======================================= Hits 12989 12989 Misses 1644 1644 ```

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