feat: add method to retrieve task sections assigned to a user and enhance permission code structure

ProgramManager/src/Infrastructure/GozareshgirProgramManager.Infrastructure/Persistence/Repositories/TaskSectionRepository.cs

@@ -28,4 +28,11 @@ public class TaskSectionRepository:RepositoryBase<Guid,TaskSection>,ITaskSection
             .Include(x => x.AdditionalTimes)
             .FirstOrDefaultAsync(x => x.Id == id, cancellationToken);
     }
+
+    public async Task<List<TaskSection>> GetAssignedToUserAsync(long userId)
+    {
+        return await _context.TaskSections
+            .Where(x => x.CurrentAssignedUserId == userId)
+            .ToListAsync();
+    }
 }