[BUG] [Spring] Wrong Api Classes Generated for spring-cloud library (Only DefaultApi, instead of one per endpoint)

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used?
• Have you search for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Bounty to sponsor the fix (example)

Description

• Whenever spring-cloud library is used for spring generator, only DefaultApi is generated.
• Whenever spring-boot library is selected, multiple Api classes are generated.

I believe the correct behaviour would be creating separate API classes just like for spring-boot, due to separation of responsabilities.

openapi-generator version

4.0.2

OpenAPI declaration file content or url

openapi: 3.0.2
paths:
  /hello:
    description: Hello World API
    get:
      summary: GET Hello World
      operationId: getHelloWorld
      parameters:
        - in: query
          name: name
          required: true
          schema:
            type: string
      responses:
        200:
          description: oi
          content:
            text/plain:
              schema:
                type: string
  /bye:
    description: Bye World API
    get:
      summary: GET Bye World
      operationId: getByeWorld
      parameters:
        - in: query
          name: name
          required: true
          schema:
            type: string
      responses:
        200:
          description: oi
          content:
            text/plain:
              schema:
                type: string

Command line used for generation

java -jar openapi-generator-cli.jar generate -i spec.yaml -g spring --library spring-cloud

Steps to reproduce

1. Get the spec
2. Run the command line
3. DefaultApi.java will be generated instead of HelloApi.java and ByeApi.java

Related issues/PRs

Couldn't find any similar issues.

Suggest a fix

I couldn't be sure what exactly the error is, but I suspect it is caused by this line, that excludes cloud library from the logic:

https://github.com/OpenAPITools/openapi-generator/blob/master/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/SpringCodegen.java#L437

Start by reproducing the issue with the supplied OpenAPI YAML and the java -jar openapi-generator-cli.jar generate -i spec.yaml -g spring --library spring-cloud command. Inspect modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/SpringCodegen.java around line 437, which the report identifies as relevant. Done means the spring-cloud output contains separate HelloApi.java and ByeApi.java classes rather than only DefaultApi.java.