Add :active attribute to SCIM API
<!-- This template is a great use for issues that are feature::additions or technical tasks for larger issues.--> ### Problem to solve The [get SCIM identities for a group](https://docs.gitlab.com/ee/api/scim.html#get-scim-identities-for-a-group) endpoint includes users who have active or inactive SCIM identities. A group owner would benefit being able to distinguish between the two states as a user can no longer be a part of their group but still have a SCIM identity. ### Proposal Expose the `:active` attribute for SCIM identities in [identity_detail.rb](https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/lib/ee/api/entities/identity_detail.rb) and add functionality to filter the results on this field. <!-- 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. --> <!-- 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. --> Related to [customer Zendesk ticket](https://gitlab.zendesk.com/agent/tickets/359763)(internal) <!-- Label reminders Use the following resources to find the appropriate labels: - https://gitlab.com/gitlab-org/gitlab/-/labels - https://about.gitlab.com/handbook/product/categories/features/ -->
issue