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

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 30.96%. Comparing base (c77aa9d) to head (8da4653).

Files	Patch %	Lines
src/OpenFga.Sdk/Model/ListUsersResponse.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #64      +/-   ##
==========================================
+ Coverage   30.74%   30.96%   +0.21%     
==========================================
  Files         120      119       -1     
  Lines        6095     6030      -65     
  Branches      792      784       -8     
==========================================
- Hits         1874     1867       -7     
+ Misses       4065     4007      -58     
  Partials      156      156              

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