Allow Enterprise group owners to set enterprise user settings via the API
<!-- This template is a great use for issues that are feature::additions or technical tasks for larger issues.--> ### Proposal <!-- Use this section to explain the feature and how it will work. It can be helpful to add technical details, design proposals, and links to related epics or issues. --> Allow Enterprise group owners to set enterprise user settings, such as `projects_limit` and `can_create_group`, using the [Update an enterprise user](https://docs.gitlab.com/api/group_enterprise_users/#update-an-enterprise-user) API endpoint. This would allow group owners to update these attributes immediately instead of waiting for the user's [next SAML authentication](https://docs.gitlab.com/user/group/saml_sso/#configure-enterprise-user-settings-from-saml-response). Changes like these should emit audit events. <!-- Consider adding related issues and epics to this issue. You can also reference the Feature Proposal Template (https://gitlab.com/gitlab-org/gitlab/-/blob/master/.gitlab/issue_templates/Feature%20proposal%20-%20detailed.md) for additional details to consider adding to this issue. Additionally, as a data oriented organization, when your feature exits planning breakdown, consider adding the `What does success look like, and how can we measure that?` section. --> <!-- Label reminders Use the following resources to find the appropriate labels: - Use only one tier label choosing the lowest tier this is intended for - https://gitlab.com/gitlab-org/gitlab/-/labels - https://about.gitlab.com/handbook/product/categories/features/ -->
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