[action][appetize] Raise error when the API returns an unsuccessful response

[benferris-tl]

Checklist

• I've run bundle exec rspec from the root directory to see all new and existing tests pass
• I've followed the fastlane code style and run bundle exec rubocop -a to ensure the code style is valid
• I see several green ci/circleci builds in the "All checks have passed" section of my PR (connect CircleCI to GitHub if not)
• I've read the Contribution Guidelines
• I've updated the documentation if necessary.
• I've added or updated relevant unit tests.

Motivation and Context

Resolves #21786

Description

Adds a check for the response status code. Tested via unit test as well as with the Appetize API by running the action using an invalid token as described in #21786

[lacostej]

Thanks @benferris-tl for reporting the issue and fixing it :)

LGTM. Anyone else?