fix allowed schema ID logic; add test

[jmanm]

Maybe I'm misunderstanding the logic, but it seems like the condition in ingest.rs should be reversed. This addresses #602.

📋 Checklist

• [x] Add tests that cover your changes
• [x] Add this PR to the Unreleased section in CHANGELOG.md
• [x] Link this PR to any issues it closes
• [x] New files contain a SPDX license header

[jmanm]

Thanks so much @jmanm for this fix and additional test! Well spotted.

I'm happy to merge this, just one small thing: For whatever reason I can't run our CI against this PR, but I just tested it locally and indeed the format checker is not happy. Can you just run cargo fmt and push this again? Otherwise our CI will cry latest when we merge into main.

Another minor nitpick: The PR number in the CHANGELOG.md is wrong (needs to be #603 instead of #602), the link is correct.

Thank you!

Done. Thanks for the feedback!