fix (walker): show description for $ref in fragments of type array

[paulatulis]

Motivation and Context

#12516

Description

Checks fragment type to see if it's an array without a description. If there's a $ref within the fragment's items, attempts to resolve the $ref to grab the $ref description and assigns it to the fragment so that it will be included in the annotations for that node.

Before

After

How Has This Been Tested?

Added tests; yalced into JSON Schema Viewer

Screenshot(s)/recordings(s)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• This PR's code follows as closely as possible the coding style/guidelines of this project.
• I have added error reporting and followed the error reporting guidelines.
• I have added event tracking and followed the event tracking guidelines.
• I have updated any relevant documentation accordingly to reflect this PR's changes.
• I have added automated tests (unit/integration/e2e/other) to cover my changes.
• All new and existing tests pass locally (excluding flaky CI tests).

[kaylachun]

LGTM! Awesome job finding the bug!

[github-actions]

🎉 This PR is included in version 2.2.5 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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