[Fix](ccr) Incorrectly generated sql with NONE aggregate type (#45452)

Execute:

```
alter table tbl enable feature "UPDATE_FLEXIBLE_COLUMNS";
```

The generated SQL in binlog:

```
ALTER TABLE `t` ADD COLUMN `__DORIS_SKIP_BITMAP_COL__` bitmap NONE NOT NULL DEFAULT BITMAP_EMPTY COMMENT "doris skip bitmap hidden column" AFTER `__DORIS_VERSION_COL__` 
```

The error message:

```
Error 1105 (HY000): errCode = 2, detailMessage = mismatched input 'NONE' expecting {<EOF>, ';'}(line 1, pos 62)
```

fe/fe-core/src/main/java/org/apache/doris/analysis/ColumnDef.java

@@ -572,7 +572,7 @@ public String toSql() {
         sb.append("`").append(name).append("` ");
         sb.append(typeDef.toSql()).append(" ");
 
-        if (aggregateType != null) {
+        if (aggregateType != null && aggregateType != AggregateType.NONE) {
             sb.append(aggregateType.name()).append(" ");
         }
 

fe/fe-core/src/test/java/org/apache/doris/analysis/ColumnDefTest.java

@@ -38,6 +38,7 @@ public class ColumnDefTest {
     private TypeDef stringCol;
     private TypeDef floatCol;
     private TypeDef booleanCol;
+    private TypeDef bitmapCol;
     private ConnectContext ctx;
 
     @Before
@@ -46,6 +47,7 @@ public void setUp() {
         stringCol = new TypeDef(ScalarType.createChar(10));
         floatCol = new TypeDef(ScalarType.createType(PrimitiveType.FLOAT));
         booleanCol = new TypeDef(ScalarType.createType(PrimitiveType.BOOLEAN));
+        bitmapCol = new TypeDef(ScalarType.createType(PrimitiveType.BITMAP));
 
         ctx = new ConnectContext();
         new MockUp<ConnectContext>() {
@@ -80,6 +82,12 @@ public void testNormal() throws AnalysisException {
         Assert.assertEquals("10", column.getDefaultValue());
         Assert.assertEquals(AggregateType.SUM, column.getAggregateType());
         Assert.assertEquals("`col` float SUM NOT NULL DEFAULT \"10\" COMMENT \"\"", column.toSql());
+
+        // agg none
+        column = new ColumnDef("col", bitmapCol, false, AggregateType.NONE, false, DefaultValue.BITMAP_EMPTY_DEFAULT_VALUE, "");
+
+        Assert.assertEquals(AggregateType.NONE, column.getAggregateType());
+        Assert.assertEquals("`col` bitmap NOT NULL DEFAULT BITMAP_EMPTY COMMENT \"\"", column.toSql());
     }
 
     @Test