Inject claim and not run

[carolynvs]

What does this change

We were accidentally injecting Porter's run represetation, which is very similar to the CNAB claim but isn't exactly the same. I've updated the code to add a test to ensure that we don't break injecting the claim.

For context, Porter doesn't use the injected claim but it is an optional part of the CNAB Claims spec, so while unused, if we are going to say we support it we should do it to spec.

What issue does it fix

Closes #2696

Notes for the reviewer

We need to communicate this in the release notes in case any bundle authors were relying on the old bugged behavior.

Checklist

• Did you write tests?
• Did you write documentation?
• Did you change porter.yaml or a storage document record? Update the corresponding schema file.
• If this is your first pull request, please add your name to the bottom of our Contributors list. Thank you for making Porter better! 🙇‍♀️

Reviewer Checklist

• Comment with /azp run test-porter-release if a magefile or build script was modified
• Comment with /azp run porter-integration if it's a non-trivial PR

[sgettys]

LGTM!