[BUG] JAX-RS does not honor sourceFolder for invoker package

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

If the property sourceFolder is set the generated classes for the invoker package are not put into this folder, so the option is not honored.

openapi-generator version

7.6.0

OpenAPI declaration file content or url

openapi: 3.0.3
info:
    title: Test
    description: Test.
    version: 1.0.0
servers:
    - url: https://localhost:29090/api
paths:
    /test:
        post:
            summary: Test.
            requestBody:
                content:
                    application/json:
                        schema:
                            type: array
                            items:
                                $ref: '#/components/schemas/TestDto'
            responses:
                '201':
                    description: OK.
components:
    schemas:
        TestDto:
            type: object
            properties:
                testId:
                    type: string
                    description: Unique ID
                    format: uuid
                mapStringToString:
                    type: object
                    additionalProperties:
                        type: string
                    description: A key/value map string to string.
                mapStringToNumber:
                    type: object
                    additionalProperties:
                        type: number
                    description: A key/value map of string to number.

Generation Details

Use options invokerPackage and sourceFolder. Set sourceFolder to "..".

Steps to reproduce

Invoke the generator once with sourceFolder:

java -jar .\openapi-generator-cli.jar generate -i test.yaml -g jaxrs-spec -o ./gen_with_source --additional-properties=invokerPackage=org.openapitools.invoker,sourceFolder=..

Compare it to the result without sourceFolder:

java -jar .\openapi-generator-cli.jar generate -i test.yaml -g jaxrs-spec -o ./gen_without_source --additional-properties=invokerPackage=org.openapitools.invoker

When generating without source folder all files are placed in the output directory in src/gen/java/...

> tree .
└───gen_without_source
    ├───.openapi-generator
    └───src
        ├───gen
        │   └───java
        │       └───org
        │           └───openapitools
        │               ├───api
        │               ├───invoker
        │               └───model
        └───main
            └───openapi

When generating with source folder most files are placed in the specified directory except the invoker package (this one is still inside, it seems to use a different current directory):

> tree .
├───gen_with_source
│   ├───.openapi-generator
│   ├───org
│   │   └───openapitools
│   │       └───invoker
│   └───src
│       └───main
│           └───openapi
└───org
    └───openapitools
        ├───api
        └───model

Related issues/PRs

Suggest a fix

Start by reproducing the jaxrs-spec generation with the two commands and compare the output trees, focusing on sourceFolder and invokerPackage handling. Trace the jaxrs-spec generator's sourceFolder entry point and add or update a regression test; done means invoker package files are placed under the configured sourceFolder, matching the other generated packages.