[BUG] [SPRING] ApiUtil does not respect generateSupportingFiles flag

Description
ApiUtil should not be used when generateSupportingFiles=false

Generator config

<plugin>
    <groupId>org.openapitools</groupId>
    <artifactId>openapi-generator-maven-plugin</artifactId>
    <version>4.2.0</version>
    <executions>
        <execution>
            <goals>
                <goal>generate</goal>
            </goals>
            <configuration>
                <inputSpec>${project.basedir}/src/main/resources/openapi.yaml</inputSpec>
                <output>${project.build.directory}/generated-sources/openapi</output>
                <generatorName>spring</generatorName>
                <generateSupportingFiles>false</generateSupportingFiles>
                <configOptions>
                    <library>spring-boot</library>
                    <java8>true</java8>
                    <interfaceOnly>true</interfaceOnly>
                    <delegatePattern>true</delegatePattern>
                    <useOptional>true</useOptional>
                    <unhandledException>true</unhandledException>
                </configOptions>
            </configuration>
        </execution>
    </executions>
</plugin>

Sample Spec

openapi: 3.0.2
info:
  title: mysample
  version: '1.0'
servers:
  - url: 'http://localhost:3000'
paths:
  /users:add:
    post:
      tags:
        - user
      summary: 'Create User'
      operationId: createUser
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/User'
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/User'
components:
  schemas:
    User:
      type: object
      properties:
        id:
          type: string
        'name':
          type: string

Actual output for delegate method

    default  ResponseEntity<List<User>> createUser(User user) {
        getRequest().ifPresent(request -> {
            for (MediaType mediaType: MediaType.parseMediaTypes(request.getHeader("Accept"))) {
                if (mediaType.isCompatibleWith(MediaType.valueOf("application/json"))) {
                    ApiUtil.setExampleResponse(request, "application/json", "{  \"name\" : \"name\",  \"id\" : \"id\"}");
                    break;
                }
            }
        });
        return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);

    }

Expected output for delegate method

    default  ResponseEntity<List<User>> createUser(User user) {
        return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
    }

Suggested fix in
https://raw.githubusercontent.com/OpenAPITools/openapi-generator/master/modules/openapi-generator/src/main/resources/JavaSpring/methodBody.mustache

The examples section in methodBody.mustache should probably check for generateSupportingFiles=false.

Also, note that the response in the OpenAPI Spec provided. It doesn't define any examples so not sure why it's getting into the examples block. It seems to just use the User Schema if an example is not defined, which seems like another bug.

Start with modules/openapi-generator/src/main/resources/JavaSpring/methodBody.mustache and inspect the examples section's handling of generateSupportingFiles=false. Run the Spring generator using the Maven configuration and sample OpenAPI spec from the issue, then verify that the generated delegate method omits the ApiUtil example-response block when supporting files are disabled. The separate behavior of generating an example from the User schema should be assessed independently.