fix graph job not erroring when fetching subs fails

[jakecoffman]

What are you trying to accomplish?

In #13463 I tried to make graph jobs error but then complete the submission.

Upon testing I found it did not error, this was because the fetch was lazy and so it was never in the errored state when it was checked.

I fixed this and made a new test that will detect that condition going forward.

Anything you want to highlight for special attention from reviewers?

How will you know you've accomplished your goal?

Manual test will confirm failures are reported correctly.

Checklist

• I have run the complete test suite to ensure all tests and linters pass.
• I have thoroughly tested my code changes to ensure they work as expected, including adding additional tests for new functionality.
• I have written clear and descriptive commit messages.
• I have provided a detailed description of the changes in the pull request, including the problem it addresses, how it fixes the problem, and any relevant details about the implementation.
• I have ensured that the code is well-documented and easy to understand.