💪 Update RestfulApiRoutesBuilder#generateRendererHandler() with ResponseFlusher structure

[StewEucen]

Why

• Close 💪 Retake RestfulApiRoutesBuilder#generateRendererHandler() with ResponseFlusher instead of #flushResponse() #367

[Copilot]

Pull Request Overview

This PR updates the RestfulApiRoutesBuilder to use the ResponseFlusher structure, ensuring that the renderer’s flushResponse method is invoked instead of the builder’s. Key changes include:

• Updating the test suite to spy on renderer.flushResponse rather than builder.flushResponse.
• Renaming the parameter key from response to renderResponse to be consistent throughout.
• Adding a new “set” method in the test stub to support chainable assertions.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
tests/tests/server/restfulapi/RestfulApiRoutesBuilder.js	Updated test descriptions and flushResponse spy to reference renderer, along with a new set() method in the stub.
lib/server/restfulapi/RestfulApiRoutesBuilder.js	Changed flushResponse call to use renderer.flushResponse with an updated parameter key.

Comments suppressed due to low confidence (1)

tests/tests/server/restfulapi/RestfulApiRoutesBuilder.js:608

• [nitpick] The addition of the 'set' method in the test stub is very generic and may lead to confusion with JavaScript's built-in setter syntax. Consider renaming it to something more descriptive or adding a comment explaining its purpose.

+        set () {

[EG-easy]

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