[BUG][Java][RestClient] Base url of RestClient is ignored

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?

Description

The baseUrl of the spring restclient is ignored, but instead, the basePath of the ApiClient is used. This is incorrect behaviour.

openapi-generator version

Since inception of library: 7.6.0.

OpenAPI declaration file content or url

Any declaration.

Generation Details

Java with the restclient library.

Steps to reproduce

Generate a client using Java with spring restclient as a library. Create an instance of an API, e.g.
MyApi(ApiClient(someRestClientBuilder.baseUrl(url).build())) then call an API. This will fall-back to the default url configured in the ApiClient localhost, but this should be url.

A workaround is to write something like MyApi(ApiClient(someRestClientBuilder.baseUrl(url).build()).setBasePath(url))

Related issues/PRs

None found

Suggest a fix

I will make a PR, if I have the time.

Start with the generated Java spring restclient entry points described in the issue: MyApi, ApiClient, and the RestClient builder. Reproduce the call using baseUrl(url), then compare how that value and ApiClient's default basePath are used. Done means requests use the builder's URL without requiring setBasePath(url); the payload names no test file, so add or locate coverage for this reproduction.