[BUG][OCaml] Generation of `Any_of` and `One_of` is missing, fails at compilation

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

The issue happens when I tried with stripe and github apis, which It could happen to any spec as well.

openapi-generator version

v5.0.0

OpenAPI declaration file content or url

https://github.com/stripe/openapi/blob/master/openapi/spec3.yaml

Generation Details

openapi-generator-cli generate -i stripe.yaml -g ocaml -o stripe --enable-post-process-file

Steps to reproduce

Run dune build inside the root project

Suggest a fix

It seems like the type doesn't exist, but I'm unsure since the error output triggers a lot of them.

Start by generating the OCaml client from stripe.yaml with the provided openapi-generator-cli command, then run dune build in the generated project to capture the compilation errors. Trace the missing Any_of and One_of types in the generated output and confirm the fix by getting the generated project to compile.