[BUG][typescript-angular & maybeothers] hasEnums returns true for reference enums leading in empty namespace generation

Description

When a schema definition has a reference to and another enum schema, the mustache template value hasEnums is set to true, despite the schema itself not having an enum.
This causes typescript-angular/modelEnum.mustache, to render an empty namespace field.

openapi-generator version

6.5.0

OpenAPI declaration file content or url

openapi: 3.0.3
info:
  title: hasEnums Demo
  version: 1.0.0
paths: {}
components:
  schemas:
    SchemaWithRefToEnum:
      type: object
      properties:
        foo:
          type: string
        bar:
          $ref: '#/components/schemas/Baz'
    Baz:
      enum:
        - Foo
        - Bar
      type: string

Steps to reproduce

generate the angular client with openapi-generator-cli generate -i [file.yaml] -g typescript-angular -o output-directory.

Then look into "output-directory/model/schemaWithRefToEnum.ts" and you will find the following result:

///...
import { EnumSchema } from './enumSchema';


export interface SchemaWithRefToEnum { 
    foo?: string;
    refToEnum?: EnumSchema;
}
export namespace SchemaWithRefToEnum {
}

The export namespace SchemaWithRefToEnum { section is empty an not needed, since it would only be present, if there was an enum directly referenced. Since it is not, this sections is empty.

Adding a bit of debug information shows the following

// modelGenericEnums.mustache
// hasEnums: true
export namespace SchemaWithRefToEnum {
// foo isEnum false
// bar isEnum false
}

Related issues/PRs

It is worth mention, that this issue is not present on https://editor.swagger.io/. Generating the typescript-angular client from there, results in the expected result --> no empty namespace is included.

Suggest a fix

If an enum is referenced via $ref, the hasEnums should not be true.

Possible places for the error:

• updateOperationParameterEnumInformation method from https://github.com/OpenAPITools/openapi-generator/blob/edfb3e123f0d3ad48992e158da957e87c3b8c3fe/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/TypeScriptReduxQueryClientCodegen.java
• updateOperationParameterForEnum method from https://github.com/OpenAPITools/openapi-generator/blob/fe8fbaf923a8d3bc3a52b6778360ef2483d5c057/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/TypeScriptFetchClientCodegen.java

Reproduce the issue with the YAML declaration and the typescript-angular generation command, then inspect model/schemaWithRefToEnum.ts and typescript-angular/modelEnum.mustache. Trace how hasEnums is populated, including the suggested TypeScript codegen methods. Done means a referenced enum no longer causes an empty namespace to be generated.