fix: response examples fallback

[mathis-m]

Description

Just some minor bug fix which I found randomly.
Base line for fixing #5433

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Checklist

My PR contains...

• No code changes (src/ is unmodified: changes to documentation, CI, metadata, etc.)
• Dependency changes (any modification to dependencies in package.json)
• Bug fixes (non-breaking change which fixes an issue)
• Improvements (misc. changes to existing features)
• Features (non-breaking change which adds functionality)

My changes...

• are breaking changes to a public API (config options, System API, major UI change, etc).
• are breaking changes to a private API (Redux, component props, utility functions, etc.).
• are breaking changes to a developer API (npm script behavior changes, new dev system dependencies, etc).
• are not breaking changes.

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• My changes do not require a change to the project documentation.
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• If yes to above: I have updated the documentation accordingly.

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• If yes to above: I have added tests to cover my changes.
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• All new and existing tests passed.

[tim-lai]

@mathis-m what does this fix?

[mathis-m]

Add media-type examples with externalValue key on a response and see the rendered version it will be the actual value of the example. E.g. It will currently render a object containing summary and other keys of the actual oas example.

https://editor.swagger.io/?url=https://gist.githubusercontent.com/mathis-m/ee4df1970042b4ec95e44a1b9a647547/raw/322738cc65896eec853b5b324080783dba0d7d52/3FMuum97cx.txt

[mathis-m]

So the logic is if there is a media type example use it if no value could be found in the schema for this example key then it should just use the first example key's value.
This fallback logic was wrong it returned the examples/*/ instead of examples/*/vaule