## Changes
Fix all errcheck-found issues in tests and test helpers. Mostly this
done by adding require.NoError(t, err), sometimes panic() where t object
is not available).
Initial change is obtained with aider+claude, then manually reviewed and
cleaned up.
## Tests
Existing tests.
## Changes
The main changes are:
1. Don't link artifacts to libraries anymore and instead just iterate
over all jobs and tasks when uploading artifacts and update local path
to remote
2. Iterating over `jobs.environments` to check if there are any local
libraries and checking that they exist locally
3. Added tests to check environments are handled correctly
End-to-end test will follow up
## Tests
Added regression test, existing tests (including integration one) pass