DuplicateRouteException thrown from Micronaut OpenAPI-generated server

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### Expected Behavior

My service should return success responses on all endpoints

### Actual Behaviour

```
$ curl localhost:8080/pets | jq .
{
"_links": {
"self": [
{
"href": "/pets",
"templated": false
}
]
},
"_embedded": {
"errors": [
{
"message": "More than 1 route matched the incoming request. The following routes matched /pets: GET - /pets, GET - /pets"
}
]
},
"message": "Bad Request"
}
```

Note: I also added a "hello world" endpoint that is not generated from the OpenAPI spec and the service responds successfully to requests on that endpoint

```
$ curl localhost:8080/
Hello World%
```

### Steps To Reproduce

1. Follow [this official guide](https://guides.micronaut.io/latest/micronaut-openapi-generator-server.html) to generate micronaut java server code from an openapi spec
2. Implement the `PetsApi` interface with stubbed success responses using Kotlin
3. `./gradlew run`
4. `$ curl localhost:8080/pets`
5. Observe the error message for duplicate routes

The output of (1) and (2) is linked as an example application

### Environment Information

Operating System: OSX Version 13.2.1 (22D68)

JDK Version
```
$ javac --version
javac 17.0.4.1
```

JRE Version
```
$ java --version
openjdk 17.0.4.1 2022-08-12
OpenJDK Runtime Environment Temurin-17.0.4.1+1 (build 17.0.4.1+1)
OpenJDK 64-Bit Server VM Temurin-17.0.4.1+1 (build 17.0.4.1+1, mixed mode)
```

### Example Application

https://github.com/lyonssp/petstore-service

### Version

4.0.2

Start with the linked petstore-service example and the generated PetsApi implementation described in the reproduction, then trace how the OpenAPI server generator registers the GET /pets route. Reproduce the request with ./gradlew run and curl; done means the generated endpoint has only one matching route and returns its success response.

Written by the indexing model from the issue text.