[fix](export) fix error in show export outfile info column (#46850)

### What problem does this PR solve?

There is a error in `OutfileInfo` column in `SHOW EXPORT` result:

before:
```
"fileSize":"33554432bytes"
```

after:
```
"fileSize":"33554432"
```

fe/fe-core/src/main/java/org/apache/doris/load/ExportTaskExecutor.java

@@ -183,7 +183,7 @@ private OutfileInfo getOutFileInfo(Map<String, String> resultAttachedInfo) {
         OutfileInfo outfileInfo = new OutfileInfo();
         outfileInfo.setFileNumber(resultAttachedInfo.get(OutFileClause.FILE_NUMBER));
         outfileInfo.setTotalRows(resultAttachedInfo.get(OutFileClause.TOTAL_ROWS));
-        outfileInfo.setFileSize(resultAttachedInfo.get(OutFileClause.FILE_SIZE) + "bytes");
+        outfileInfo.setFileSize(resultAttachedInfo.get(OutFileClause.FILE_SIZE));
         outfileInfo.setUrl(resultAttachedInfo.get(OutFileClause.URL));
         return outfileInfo;
     }

fe/fe-core/src/test/java/org/apache/doris/load/ExportOutfileInfoTest.java

@@ -0,0 +1,84 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package org.apache.doris.load;
+
+import org.apache.doris.persist.gson.GsonUtils;
+
+import com.google.common.collect.Lists;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.List;
+
+public class ExportOutfileInfoTest {
+
+    @Test
+    public void testOutfileInfo() throws Exception {
+        // outfileInfoList1
+        OutfileInfo outfileInfo1 = new OutfileInfo();
+        outfileInfo1.setFileNumber("2");
+        outfileInfo1.setTotalRows("1234");
+        outfileInfo1.setFileSize("10240");
+        outfileInfo1.setUrl("file:///172.20.32.136/path/to/result2_c6df5f01bd664dde-a2168b019b6c2b3f_*");
+
+        OutfileInfo outfileInfo2 = new OutfileInfo();
+        outfileInfo2.setFileNumber("2");
+        outfileInfo2.setTotalRows("1235");
+        outfileInfo2.setFileSize("10250");
+        outfileInfo2.setUrl("file:///172.20.32.136/path/to/result2_c6df5f01bd664dde-a2168b019b6c2b3f_*");
+
+        List<OutfileInfo> outfileInfoList1 = Lists.newArrayList();
+        outfileInfoList1.add(outfileInfo1);
+        outfileInfoList1.add(outfileInfo2);
+
+        // outfileInfoList2
+        OutfileInfo outfileInfo3 = new OutfileInfo();
+        outfileInfo3.setFileNumber("3");
+        outfileInfo3.setTotalRows("2345");
+        outfileInfo3.setFileSize("20260");
+        outfileInfo3.setUrl("file:///172.20.32.137/path/to/result2_c6df5f01bd664dde-a2168b019b6c2b3f_*");
+
+        OutfileInfo outfileInfo4 = new OutfileInfo();
+        outfileInfo4.setFileNumber("3");
+        outfileInfo4.setTotalRows("2346");
+        outfileInfo4.setFileSize("20270");
+        outfileInfo4.setUrl("file:///172.20.32.137/path/to/result2_c6df5f01bd664dde-a2168b019b6c2b3f_*");
+
+        List<OutfileInfo> outfileInfoList2 = Lists.newArrayList();
+        outfileInfoList2.add(outfileInfo3);
+        outfileInfoList2.add(outfileInfo4);
+
+        List<List<OutfileInfo>> allOutfileInfo = Lists.newArrayList();
+        allOutfileInfo.add(outfileInfoList1);
+        allOutfileInfo.add(outfileInfoList2);
+
+        String showInfo = GsonUtils.GSON.toJson(allOutfileInfo);
+        System.out.println(showInfo);
+        Assert.assertEquals(
+                "[[{\"fileNumber\":\"2\",\"totalRows\":\"1234\",\"fileSize\":\"10240\","
+                        + "\"url\":\"file:///172.20.32.136/path/to/result2_c6df5f01bd664dde-a2168b019b6c2b3f_*\"},"
+                        + "{\"fileNumber\":\"2\",\"totalRows\":\"1235\",\"fileSize\":\"10250\","
+                        + "\"url\":\"file:///172.20.32.136/path/to/result2_c6df5f01bd664dde-a2168b019b6c2b3f_*\"}],"
+                        + "[{\"fileNumber\":\"3\",\"totalRows\":\"2345\",\"fileSize\":\"20260\","
+                        + "\"url\":\"file:///172.20.32.137/path/to/result2_c6df5f01bd664dde-a2168b019b6c2b3f_*\"},"
+                        + "{\"fileNumber\":\"3\",\"totalRows\":\"2346\",\"fileSize\":\"20270\","
+                        + "\"url\":\"file:///172.20.32.137/path/to/result2_c6df5f01bd664dde-a2168b019b6c2b3f_*\"}]]",
+                showInfo);
+    }
+
+}

regression-test/suites/export_p0/test_with_bom.groovy

@@ -126,7 +126,7 @@ suite("test_with_bom", "p0") {
                                 """
 
         // check outfile bytes
-        check_bytes("145bytes", label)
+        check_bytes("145", label)
     } finally {
     }
 
@@ -165,7 +165,7 @@ suite("test_with_bom", "p0") {
                                 """
 
         // check outfile bytes
-        check_bytes("148bytes", label)
+        check_bytes("148", label)
     } finally {
     }
 
@@ -204,7 +204,7 @@ suite("test_with_bom", "p0") {
                                 """
 
         // check outfile bytes
-        check_bytes("161bytes", label)
+        check_bytes("161", label)
     } finally {
     }
 
@@ -243,7 +243,7 @@ suite("test_with_bom", "p0") {
                                 """
 
         // check outfile bytes
-        check_bytes("172bytes", label)
+        check_bytes("172", label)
     } finally {
     }
 }