[runtime_env] Add print statements to `TestGC` tests (#23716)
[runtime_env] Add print statements to `TestGC` tests (#23716)

The tests in `TestGC` are flaky due to timeout ([example 1](https://buildkite.com/ray-project/ray-builders-branch/builds/6868#5540f19e-3669-46eb-a4ee-c71a1252f9ae), [example 2](https://buildkite.com/ray-project/ray-builders-branch/builds/6872#8912eb47-eb63-40c9-949f-a020a5f8f42d)):

<img width="1304" alt="Screen Shot 2022-04-05 at 11 30 04 AM" src="https://user-images.githubusercontent.com/92341594/161825080-c2fe3887-f87c-4175-924f-80ae9b371157.png">

This change adds print statements to the `TestGC` tests to detect where they're hanging.
ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray