[BUG] Elm Discriminator generates non-existent exports

[TheOddler]

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?

Description

When generating Elm code for something that uses a discriminator it add some non-existent things to the exposing (...) list in the Data.elm file.

openapi-generator version

6.6.0

❯ openapi-generator-cli --version
openapi-generator-cli 6.6.0
  commit : 7f8b853
  built  : -999999999-01-01T00:00:00+18:00
  source : https://github.com/openapitools/openapi-generator
  docs   : https://openapi-generator.tech/

OpenAPI declaration file content or url

https://gist.github.com/TheOddler/6cc108f76c5c123900f9741af0bb408b

Generation Details

❯ openapi-generator-cli generate -g elm -i backend/openapi/openapi-bug-mininal.json -o frontend/generated

Steps to reproduce

1. Download the above linked content, and generate elm code from it.
2. Open the src/Api/Data.elm file
3. See that it added ExampleTag(..) and exampleTagVariants to the exposed stuff
4. Notice that neither of those actually exist in the file anywhere else

Related issues/PRs

Suggest a fix

I think those two exports should just not be added, then everything works (at least manually doing that seems to have fixed it for me).

[Qluxzz]

Please try this again now that version 7.0.0 has been released. I have rewritten a large part of the generator in #15257