chore!: remove excluded users from ListUsers response

[ewanharris]

Description

Removes excluded_users from the response of all SDKs as it was removed from OpenFGA with openfga/api#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: Removing excluded users from ListUsers response sdk-generator#377
• Related PR in openfga/api: Removing excluded users api#171

Review Checklist

• 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]
• 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

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.37%. Comparing base (326fd27) to head (a56da62).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #101      +/-   ##
==========================================
+ Coverage   68.06%   68.37%   +0.31%     
==========================================
  Files         114      113       -1     
  Lines        8968     8917      -51     
==========================================
- Hits         6104     6097       -7     
+ Misses       2864     2820      -44     

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