Don't run `update-tests-metadata` if needed jobs failed

What does this MR do and why?

Don't run update-tests-metadata if needed jobs failed

If we run it when needed jobs failed, we can be missing metadata from those failed jobs.

We noticed this from https://gitlab.com/gitlab-org/gitlab/-/jobs/7393244546 where it's not downloading artifacts from rspec:artifact-collector unit and rspec:artifact-collector ee unit, because those collectors were skipped, and they're skipped because their respective jobs failed. That is, some unit test jobs failed.

This became a more obvious problem after !159241 (merged) because with dependencies on each individual jobs, we're just missing a few failed jobs, but now with the collectors we're missing a whole set of jobs.

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