fix: 마이그레이션 임포트를 옵셔널로 변경

Author: lvalentine6

src/main/resources/application-migration.yml

@@ -16,7 +16,7 @@ spring:
       max-request-size: 10MB
 
   config:
-    import: "aws-parameterstore:/prod/"
+    import: "optional:aws-parameterstore:/prod/"
 
   datasource:
     url: ${MIGRATION_RDS_URL}