feat: implemented date filtration and a utils service to prevent code ducplication

MyINPulse-back/src/main/java/enseirb/myinpulse/repository/SectionCellRepository.java

@@ -6,8 +6,13 @@ import enseirb.myinpulse.model.SectionCell;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.rest.core.annotation.RepositoryRestResource;
 
+import java.time.LocalDateTime;
+
 @RepositoryRestResource
 public interface SectionCellRepository extends JpaRepository<SectionCell, Long> {
 
     Iterable<SectionCell> findByProjectSectionCellAndSectionId(Project project, long sectionId);
+
+    Iterable<SectionCell> findByProjectSectionCellAndSectionIdAndModificationDateBefore(
+            Project project, long sectionId, LocalDateTime date);
 }