CLOUDP-291457: IPA-123 ArraySchema fix

[yelizhenden-mdb]

Proposed changes

In scope of Jira ticket: CLOUDP-291457

This PR addresses the handling of exceptions defined on array schema definitions. Specifically, exceptions applied at the schema level preceding items.enum are not properly matched.

Changes:

• Updated the logic to remove enum from the path when it directly follows items.
• This ensures that exceptions defined at the array schema level (before items.enum) are correctly recognized during validation.

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