chore!: remove excluded users from ListUsers response

Description

Removes excluded_users from the response of all SDKs as it was removed from OpenFGA with https://github.com/openfga/api/pull/171.

This feature was originally a well-intentioned way to communicate any negations that may exist on public-typed wildcard (e.g. user:*) as a means of being abundantly clear about what a user:* result entails. However, as we discover more possible situations where excluded users could arise, we realize that we were making a premature decision about the API. We fully intend to re-add excluded_users at some point in the future but may or may not be a flattened list as previously implemented.

Please note:

This is technically a breaking but is acceptable provided that the ListUsers API is still experimental

References

Related PR in openfga/sdk-generator: https://github.com/openfga/sdk-generator/pull/377
Related PR in openfga/api: https://github.com/openfga/api/pull/171

Review Checklist

[x] I have clicked on "allow edits by maintainers".
[ ] I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
[x] The correct base branch is being used, if not main
[ ] I have added tests to validate that the change in functionality is working as expected

openfga / python-sdk