IPA-114: Errors (fix for exception level)

[yelizhenden-mdb]

Proposed changes

Jira ticket: CLOUDP-304960

Fixes:

• Exceptions will only be collected at the response level.
• There might be multiple errors for one response, assuming there might be several versions of responses (CLOUDP-276969)
• Add error if referenced schema is not valid
  (openapi-api-registry.json refers to schemas in openapi-mms.json, which cannot be resolved in custom Spectral rule functions, therefore they will appear as errors)
• For investigating external schema reference resolution further, CLOUDP-309694 is created

Checklist

• I have signed the MongoDB CLA
• I have added tests that prove my fix is effective or that my feature works

Changes to Spectral

• I have read the README file for Spectral Updates

Further comments

[lovisaberggren]

FYI this is probably why the external spec references don't work, since we're passing the unresolved spec

One option to consider could be to run the validation on the resolved spec, but when evaluating the object, use the passed unresolvedDocument to see the schema ref name

[yelizhenden-mdb]

Discussed offline. For now, we will proceed with the current approach, and for the API Registry violations, I will note down the limitation in the exception reason, and refer to the investigation ticket