cloudstorage(ticdc): Remove nfs schema file check (#10138) (#10154)

close #10137

pkg/sink/cloudstorage/path.go

@@ -221,17 +221,17 @@ func (f *FilePathGenerator) CheckOrWriteSchema(
 	// Case 2: the table meta path is not empty.
 	if schemaFileCnt != 0 {
 		if lastVersion == 0 {
-			log.Panic("no table schema file found in an non-empty meta path",
+			log.Warn("no table schema file found in an non-empty meta path",
 				zap.Any("versionedTableName", table),
 				zap.Uint32("checksum", checksum))
 		}
 		f.versionMap[table] = lastVersion
 		return nil
 	}
 
-	// Case 3: the table meta path is empty, which only happens when the table is
-	// existed before changefeed started. We need to write schema file to external
-	// storage.
+	// Case 3: the table meta path is empty, which happens when:
+	//  a. the table is existed before changefeed started. We need to write schema file to external storage.
+	//  b. the schema file is deleted by the consumer. We write schema file to external storage too.
 	encodedDetail, err := def.MarshalWithQuery()
 	if err != nil {
 		return err