Shift the invalid function config error to a warning

[jpwilliams]

We just log this in case someone has included extra properties.

Summary

Make the Config invalid for function error a warning instead; we still register the function in question and only really use this log to highlight extraneous keys.

Checklist

• [ ] ~Added a docs PR that references this PR~ N/A
• [ ] ~Added unit/integration tests~ N/A
• [x] Added changesets if applicable

Related

• Helps with issues like #630 not appear so threatening

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: d611339d9a833ee32c4757a6f0846986c16154d6

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

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