Update group sync to work with AD - SAML ids (#17108)

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

einterfaces/ldap.go

@@ -24,5 +24,6 @@ type LdapInterface interface {
 	FirstLoginSync(user *model.User, userAuthService, userAuthData, email string) *model.AppError
 	UpdateProfilePictureIfNecessary(model.User, model.Session)
 	GetADLdapIdFromSAMLId(authData string) string
+	GetSAMLIdFromADLdapId(authData string) string
 	GetVendorNameAndVendorVersion() (string, string)
 }