[BUG][erlang-server] same path handled by 2 modules

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?
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Description

The generator generates code where some methods are handled by a different module. This doesn't work with cowboy and you end up with confusing 405.

openapi-generator version

openapi-generator-cli 5.2.0-SNAPSHOT
commit : f48311d

OpenAPI declaration file content or url

https://raw.githubusercontent.com/jdegre/5GC_APIs/master/TS29509_Nausf_UEAuthentication.yaml

Generation Details

docker run --rm -v "${PWD}:/local" openapitools/openapi-generator-cli generate -i /local/TS29509_Nausf_UEAuthentication.yaml -o /local/out/erlang/29509 -g erlang-server

get_operations() ->
    #{ 
        'Delete5gAkaAuthenticationResult' => #{
            path => "/nausf-auth/v1/ue-authentications/:authCtxId/5g-aka-confirmation",
            method => <<"DELETE">>,
            handler => 'openapi_authentication_result_deletion_handler'
       },
       
      ......
      
        'UeAuthenticationsAuthCtxId5gAkaConfirmationPut' => #{
            path => "/nausf-auth/v1/ue-authentications/:authCtxId/5g-aka-confirmation",
            method => <<"PUT">>,
            handler => 'openapi_default_handler'
        },

Steps to reproduce

Related issues/PRs

Suggest a fix

The generator should make sure one type of path can only point to one handler

Reproduce the erlang-server generation with TS29509_Nausf_UEAuthentication.yaml using the Docker command in the issue, then inspect the generated get_operations() entries for the conflicting path. Done means each path is associated with a handler arrangement that works with Cowboy and no longer produces the reported 405 response.