AspNetCore Controller with CancellationToken parameter

Description

When generating the server as a library, the Task methods don't have the CancellationToken parameter.
This is because the template currently renders the CancellationToken only if the options operationResultTask and operationIsAsync are set to true. But operationIsAsync is always false in the case of a library output.
This fix intends to render the CancellationToken only under the operationResultTask option.

openapi-generator version

Latest. Not a regression as the CancellationToken generation has been introduced in Jan 2023 and has been working as described above since then.

OpenAPI declaration file content or url

openapi: 3.0.2
info:
  version: '1.0'
  title: Thing manager
servers:
  - url: http://localhost:5010
paths:
  /:
    get:
      summary: Hello
      operationId: hello
      tags:
        - thing
      responses:
        '200':
          description: Success

Command line used for generation

docker run --rm -v C:\Users\xxx\source\repos\OpenAPI_aspnetcore_CancellationTokenTest\repro:/src openapitools/openapi-generator-cli:latest generate -i /src/spec/combined_openapi.yaml -g aspnetcore -o /src/gen -c /src/generator/generator-config.yaml

Content of the generator-config.yaml:

additionalProperties:
  aspnetCoreVersion: 6.0
  buildTarget: library
  enumValueSuffix: ""
  operationResultTask: true
  packageName: ThingManager.Generated
  sourceFolder: ""
  useSwashbuckle: false
  useNewtonsoft: true
templateDir: .          # relative to location of generator-config.yml

Steps to reproduce

No CancellationToken generator in the controller method

Related issues/PRs

Introduction of CancellationToken:
https://github.com/OpenAPITools/openapi-generator/pull/14326
operationIsAsync explicitly hard coded to false in the library output case:
https://github.com/OpenAPITools/openapi-generator/pull/2629

Start with the aspnetcore generator output from the provided OpenAPI declaration and generator-config.yaml, focusing on how operationResultTask and operationIsAsync control the controller method signature. Reproduce the Docker generation command and verify that a library build with operationResultTask enabled includes a CancellationToken parameter in generated Task methods.