Operation example should resolve example for multiple responses correctly

[timotheeguerin]

Playground Link

import "@typespec/http";

using TypeSpec.Http;

model UserFields {
  name: string;
}

@opExample(
  #{ returnType: #{ statusCode: 200, user: #[#{ name: "abc" }] } },
  #{ title: "Example 1" }
)
@opExample(
  #{ returnType: #{ statusCode: 404, error: "No user with this name" } },
  #{ title: "Not found" }
)
op list(): {
  @statusCode statusCode: 200;
  @bodyRoot user: UserFields[];
} | (NotFoundResponse & {
  error: string;
});

Result in this both both responses

examples:
                Not found:
                  summary: Not found
                  value: {}
                Example 1:
                  summary: Example 1
                  value: {}

There is 2 issues:

1. the value are not actually populated
2. only the matching response should have the example