feat : progressStep 에서 project_id -> projectId 으로 변경

- 컨벤션으로 인한 수정

연관 이슈
- #252

module-service/src/main/java/com/checkping/service/project/ProjectServiceImpl.java

@@ -54,7 +54,7 @@ public ProjectResponse.ProjectDto registerProject(ProjectRequest.ResisterDto req
 
         for (ProgressStep.CurrentStep step : ProgressStep.CurrentStep.values()) {
             ProgressStep progressStep = ProgressStep.builder()
-                    .project_id(project.getId())
+                    .projectId(project.getId())
                     .name(step.getDescription())
                     .build();