Respect DefaultUserIsRestricted system default when creating new user (#19310)

* Apply DefaultUserIsRestricted in CreateUser

* Enforce system defaults in CreateUser

Allow for overwrites with CreateUserOverwriteOptions

* Fix compilation errors

* Add "restricted" option to create user command

* Add "restricted" option to create user admin api

* Respect default setting.Service.RegisterEmailConfirm and setting.Service.RegisterManualConfirm where needed

* Revert "Respect default setting.Service.RegisterEmailConfirm and setting.Service.RegisterManualConfirm where needed"

This reverts commit ee95d3e8dc.

modules/structs/admin_user.go

@@ -19,6 +19,7 @@ type CreateUserOption struct {
 	Password           string `json:"password" binding:"Required;MaxSize(255)"`
 	MustChangePassword *bool  `json:"must_change_password"`
 	SendNotify         bool   `json:"send_notify"`
+	Restricted         *bool  `json:"restricted"`
 	Visibility         string `json:"visibility" binding:"In(,public,limited,private)"`
 }