Add WorkItemTypeUpdate GraphQL mutation

What does this MR do and why?

Introduce a new GraphQL mutation called WorkItemTypeUpdate for work item type management that establishes the foundation for updating work item type attributes including name, icon name, and archiving functionality.

Current implementation:

• Validate work_item_configurable_types feature flag is enabled
• Enforce container restrictions (root group or organization level)
• Use the current organization context when full_path of the root group is not provided
• Return existing work item type without modifications

Additional changes:

• Add support for organizations as resource parents in work item type licensing checks. Organizations use License.feature_available? directly since they don't implement licensed_feature_available? method, enabling proper functionality when no full_path is provided and the system defaults to current_organization.

Follow-up implementation:

• Due to blocker MRs, the mutation accepts update arguments (name, icon_name, archive) but does not yet perform actual updates.
• In a follow-up MR (after !219133 (merged) is merged), when a system-defined work item type is provided, the mutation will create a custom work item type with the updated attributes.
• In a follow-up MR (after !221664 (merged) is merged), authorization will be added using update_work_item_permission check which validates licensed features and ensures the user has root maintainer+ role.

References

• gitlab-org#19883
• #581936 (closed)

Screenshots or screen recordings

With a full_path
Without a full_path
With FF disabled
With invalid ID

How to set up and validate locally

1. Run the following query with work_item_configurable_types feature flag enabled and disabled.
2. When the feature flag is enabled, the mutation should return an existing work item type without any modifications.

Click to expand

mutation UpdateWorkItemType($input: WorkItemTypeUpdateInput!) {
  workItemTypeUpdate(input: $input) {
    workItemType {
      id
      name
      iconName
    }
    errors
  }
}

{
  "input": {
    "id": "gid://gitlab/WorkItems::Type/1",
    "fullPath": "root-group-name",
    "name": "Updated Name",
    "iconName": "updated-icon-name",
    "archive": false
  }
}

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