[ISSUE ##4865] Improve readability of failed topic list log (#4868)

Signed-off-by: Rohit Satya <[email protected]>

Author: rohit-satya

Diff for: eventmesh-runtime/src/main/java/org/apache/eventmesh/runtime/core/protocol/http/processor/DeleteTopicProcessor.java

@@ -122,10 +122,11 @@ public void handler(HandlerService.HandlerSpecific handlerSpecific, HttpRequest
 
                 Map<String, Object> responseBodyMap = new HashMap<>();
                 StringBuilder sb = new StringBuilder();
-                sb.append(faildTopic.toString()).append(" not exist in eventmesh");
-                HTTP_LOGGER.warn("delete topic fail, {}", sb.toString());
+                String topics = String.join(", ", faildTopic);
+                sb.append(topics).append(" do not exist in eventmesh");
+                HTTP_LOGGER.warn("delete topic fail, {}", sb);
                 responseBodyMap.put("retCode", EventMeshRetCode.EVENTMESH_OPERATE_FAIL.getRetCode());
-                responseBodyMap.put("retMsg", EventMeshRetCode.EVENTMESH_OPERATE_FAIL.getErrMsg() + sb.toString());
+                responseBodyMap.put("retMsg", EventMeshRetCode.EVENTMESH_OPERATE_FAIL.getErrMsg() + sb);
                 responseWrapper = requestWrapper.createHttpResponse(responseHeaderMap, responseBodyMap);
                 responseWrapper.setHttpResponseStatus(HttpResponseStatus.BAD_REQUEST);
                 handlerSpecific.sendErrorResponse(EventMeshRetCode.EVENTMESH_OPERATE_FAIL, responseHeaderMap,