CLAP-153 Fix: 이전 처리자 이름 매핑 삭제

Author: parkjaehak

src/main/java/clap/server/adapter/inbound/web/dto/task/response/FindTaskHistoryResponse.java

@@ -25,8 +25,7 @@ public static record Details(
     ) {}
 
     public static record ProcessorChanged(
-            String previousProcessor,
-            String currentProcessor
+            String processorName
     ) {}
 
     public static record TaskStatusSwitched(

src/main/java/clap/server/application/mapper/TaskHistoryMapper.java

@@ -21,7 +21,6 @@ public static FindTaskHistoryResponse toFindTaskHistoryResponse(List<TaskHistory
                             switch (taskHistory.getType()) {
                                 case PROCESSOR_CHANGED, PROCESSOR_ASSIGNED -> new FindTaskHistoryResponse.Details(
                                         new FindTaskHistoryResponse.ProcessorChanged(
-                                                null, //TODO: 이전 처리자 이름 검토
                                                 taskHistory.getTaskModificationInfo().getModifiedMember().getNickname()
                                         ),
                                         null,