[OCaml] Code generation fixes

Created by: MisterDA

The bugs were discovered using the Docker spec.

The Lwt module has functions that might shadow parameters, and all the functions we use from Lwt are in Lwt.Infix too.

File "src/apis/image_api.ml", line 13, characters 69-72:
13 |     let uri = Request.maybe_add_query_param uri "all" string_of_bool all in
                                                                          ^^^
Error: This expression has type 'a t list -> 'a list t
       but an expression was expected of type bool option

ref #9787 (closed)

PR checklist

• Read the contribution guidelines.
• Pull Request title clearly describes the work in the pull request and Pull Request description provides details about how to validate the work. Missing information here may result in delayed response from the community.
• Run the following to build the project and update samples:

  ./mvnw clean package 
  ./bin/generate-samples.sh
  ./bin/utils/export_docs_generators.sh

  Commit all changed files. This is important, as CI jobs will verify all generator outputs of your HEAD commit as it would merge with master. These must match the expectations made by your contribution. You may regenerate an individual generator by passing the relevant config(s) as an argument to the script, for example ./bin/generate-samples.sh bin/configs/java*. For Windows users, please run the script in Git BASH.
• If your PR is targeting a particular programming language, @mention the technical committee members, so they are more likely to review the pull request.

@cgensoul