Add Organizations::Stateful concern with state machine
## What Introduce an `Organizations::Stateful` concern modelled after `Namespaces::Stateful`, but stripped of concepts that don't apply to organizations (ancestor inheritance, archival, transfers, state preservation). ## States | Value | Name | Description | |-------|------|-------------| | 0 | `active` | Default. Organization is fully operational. | | 1 | `deletion_scheduled` | Soft-deleted. Invisible to non-admins. Reversible. | | 2 | `deletion_in_progress` | Hard-deletion worker is running. | ## Implementation plan See https://gitlab.com/gitlab-org/gitlab/-/merge_requests/230909+s.
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