Add User To Content Restriction

Updates content restrictions by adding a user to a specific operation-based restriction on a Confluence content item. This endpoint allows administrators to grant a particular user permission to perform a specified operation (such as 'read' or 'update') on restricted content by adding them to the allowlist for that operation. The request requires the content ID, the operation key (the type of restriction being modified), and the user details to be added. This is useful for managing granular a...