ci/cd: migrate backend linter to v2. fixed unit test workflow (#400)

backend/internal/service/custom_claim_service.go

@@ -105,9 +105,10 @@ func (s *CustomClaimService) updateCustomClaims(idType idType, value string, cla
 			Value: claim.Value,
 		}
 
-		if idType == UserID {
+		switch idType {
+		case UserID:
 			customClaim.UserID = &value
-		} else if idType == UserGroupID {
+		case UserGroupID:
 			customClaim.UserGroupID = &value
 		}