Request Body examples should respect media-type

[mathis-m]

Description

Request Body samples do not respect the media type selected.
It just stringifies the json representation of the sample provided via examples or example keyword.
It should use the getSampleSchema method, which does take care of the content-type // media-type.

Motivation and Context

How Has This Been Tested?

Fixes #6475

Screenshots (if appropriate):

see #6475

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.

Documentation

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

Automated tests

• My changes can not or do not need to be tested.
• My changes can and should be tested by unit and/or integration tests.
• If yes to above: I have added tests to cover my changes.
• If yes to above: I have taken care to cover edge cases in my tests.
• All new and existing tests passed.

[mathis-m]

@tim-lai its been a while, could you have a look at this PR and pull it into mainline. It fixes the sample generation for request body related to #6470 .

[tim-lai]

@mathis-m Catching up on holiday backlog. This PR is now merged. Thanks for the fix!

[mathis-m]

@tim-lai nice :) best wishes for the new year!