* Add ConfirmOrganizationUserCommand and IConfirmOrganizationUserCommand interface for managing organization user confirmations
* Add unit tests for ConfirmOrganizationUserCommand to validate user confirmation scenarios
* Register ConfirmOrganizationUserCommand for dependency injection
* Refactor OrganizationUsersController to utilize IConfirmOrganizationUserCommand for user confirmation processes
* Remove ConfirmUserAsync and ConfirmUsersAsync methods from IOrganizationService and OrganizationService
* Rename test methods in ConfirmOrganizationUserCommandTests for clarity and consistency
* Update test method name in ConfirmOrganizationUserCommandTests for improved clarity
