Add a util method to make an http async request in the tests

Author: Slimane AMAR

src/main/java/org/gridsuite/modification/server/repositories/NetworkModificationRepository.java

@@ -549,11 +549,6 @@ public Integer getModificationsCount(@NonNull UUID groupUuid, boolean stashed) {
         return modificationRepository.countByGroupIdAndStashed(groupUuid, stashed);
     }
 
-    @Transactional(readOnly = true)
-    public List<ModificationInfos> getModificationsInfos(@NonNull List<UUID> uuids) {
-        return getModificationsInfosNonTransactional(uuids);
-    }
-
     private List<ModificationInfos> getModificationsInfosNonTransactional(List<UUID> uuids) {
         // Spring-data findAllById doc says: the order of elements in the result is not guaranteed
         Map<UUID, ModificationEntity> entities = modificationRepository.findAllById(uuids)