fix(request-duration): Set response duration in failure cases

[AndreMantas]

Description

Request duration is not being populated for non-200 responses

According to live-response.jsx the duration component will only be rendered if the response duration is set
https://github.com/swagger-api/swagger-ui/blob/master/src/core/components/live-response.jsx#L124

But that was not happening on the 'catch' block
https://github.com/swagger-api/swagger-ui/blob/master/src/core/plugins/spec/actions.js#L471-L487

Motivation and Context

Fixes #6618

How Has This Been Tested?

Unit tests

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.

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.