[opt](paimon)Remove unnecessary fields (apache#44906)

### What problem does this PR solve?

Related PR: apache#44274

Problem Summary:

We have already set the serialization table in `TFileScanRangeParams`,
so there is no need to repeat it for each split.

fe/fe-core/src/main/java/org/apache/doris/datasource/paimon/source/PaimonScanNode.java

@@ -183,9 +183,7 @@ private void setPaimonParams(TFileRangeDesc rangeDesc, PaimonSplit paimonSplit)
         fileDesc.setDbId(((PaimonExternalTable) source.getTargetTable()).getDbId());
         fileDesc.setTblId(source.getTargetTable().getId());
         fileDesc.setLastUpdateTime(source.getTargetTable().getUpdateTime());
-        fileDesc.setPaimonTable(encodeObjectToString(source.getPaimonTable()));
-        // The hadoop conf should be same with
-        // PaimonExternalCatalog.createCatalog()#getConfiguration()
+        // The hadoop conf should be same with PaimonExternalCatalog.createCatalog()#getConfiguration()
         fileDesc.setHadoopConf(source.getCatalog().getCatalogProperty().getHadoopProperties());
         Optional<DeletionFile> optDeletionFile = paimonSplit.getDeletionFile();
         if (optDeletionFile.isPresent()) {