MM-28882:ignore guest ldap sync (#15936)

* add ignoreGuestsLdapSync to config, update interface

* update interface

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

einterfaces/ldap.go

@@ -20,7 +20,7 @@ type LdapInterface interface {
 	MigrateIDAttribute(toAttribute string) error
 	GetGroup(groupUID string) (*model.Group, *model.AppError)
 	GetAllGroupsPage(page int, perPage int, opts model.LdapGroupSearchOpts) ([]*model.Group, int, *model.AppError)
-	FirstLoginSync(userID, userAuthService, userAuthData, email string) *model.AppError
+	FirstLoginSync(user *model.User, userAuthService, userAuthData, email string) *model.AppError
 	UpdateProfilePictureIfNecessary(model.User, *model.Session)
 	GetADLdapIdFromSAMLId(authData string) string
 }